diff --git a/musikr/src/main/java/org/oxycblt/musikr/Music.kt b/musikr/src/main/java/org/oxycblt/musikr/Music.kt
index 5f5eea035..48d3c16e7 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/Music.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/Music.kt
@@ -94,7 +94,7 @@ sealed interface Music {
 
         override fun toString() = "${format.namespace}:${item.intCode.toString(16)}-$uuid"
 
-        enum class Item(val intCode: Int) {
+        internal enum class Item(val intCode: Int) {
             // Item used to be MusicType back when the music module was
             // part of Auxio, so these old integer codes remain.
             // TODO: Introduce new UID format that removes these.
@@ -126,7 +126,7 @@ sealed interface Music {
             @TypeConverter fun toMusicUid(string: String?) = string?.let(Companion::fromString)
         }
 
-        companion object {
+        internal companion object {
             /**
              * Creates an Auxio-style [UID] of random composition. Used if there is no
              * non-subjective, unlikely-to-change metadata of the music.
diff --git a/musikr/src/main/java/org/oxycblt/musikr/Musikr.kt b/musikr/src/main/java/org/oxycblt/musikr/Musikr.kt
index df3758d6a..4828b522e 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/Musikr.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/Musikr.kt
@@ -55,7 +55,7 @@ sealed interface IndexingProgress {
     data object Indeterminate : IndexingProgress
 }
 
-class MusikrImpl(
+private class MusikrImpl(
     private val exploreStep: ExploreStep,
     private val extractStep: ExtractStep,
     private val evaluateStep: EvaluateStep
diff --git a/musikr/src/main/java/org/oxycblt/musikr/cache/Cache.kt b/musikr/src/main/java/org/oxycblt/musikr/cache/Cache.kt
index 0c286645b..89639a33c 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/cache/Cache.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/cache/Cache.kt
@@ -18,7 +18,7 @@
  
 package org.oxycblt.musikr.cache
 
-import org.oxycblt.musikr.fs.query.DeviceFile
+import org.oxycblt.musikr.fs.DeviceFile
 import org.oxycblt.musikr.pipeline.RawSong
 
 interface Cache {
diff --git a/musikr/src/main/java/org/oxycblt/musikr/cache/CacheDatabase.kt b/musikr/src/main/java/org/oxycblt/musikr/cache/CacheDatabase.kt
index 07a3d069a..bdd804241 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/cache/CacheDatabase.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/cache/CacheDatabase.kt
@@ -31,7 +31,7 @@ import androidx.room.RoomDatabase
 import androidx.room.TypeConverter
 import androidx.room.TypeConverters
 import org.oxycblt.musikr.cover.Cover
-import org.oxycblt.musikr.fs.query.DeviceFile
+import org.oxycblt.musikr.fs.DeviceFile
 import org.oxycblt.musikr.metadata.Properties
 import org.oxycblt.musikr.pipeline.RawSong
 import org.oxycblt.musikr.tag.Date
diff --git a/musikr/src/main/java/org/oxycblt/musikr/cover/CoverIdentifier.kt b/musikr/src/main/java/org/oxycblt/musikr/cover/CoverIdentifier.kt
index ef0917e05..7fa3b50fc 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/cover/CoverIdentifier.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/cover/CoverIdentifier.kt
@@ -20,7 +20,7 @@ package org.oxycblt.musikr.cover
 
 import java.security.MessageDigest
 
-interface CoverIdentifier {
+internal interface CoverIdentifier {
     suspend fun identify(data: ByteArray): String
 
     companion object {
diff --git a/musikr/src/main/java/org/oxycblt/musikr/fs/DeviceFile.kt b/musikr/src/main/java/org/oxycblt/musikr/fs/DeviceFile.kt
new file mode 100644
index 000000000..32a58450f
--- /dev/null
+++ b/musikr/src/main/java/org/oxycblt/musikr/fs/DeviceFile.kt
@@ -0,0 +1,11 @@
+package org.oxycblt.musikr.fs
+
+import android.net.Uri
+
+data class DeviceFile(
+    val uri: Uri,
+    val mimeType: String,
+    val path: Path,
+    val size: Long,
+    val lastModified: Long
+)
\ No newline at end of file
diff --git a/musikr/src/main/java/org/oxycblt/musikr/fs/Format.kt b/musikr/src/main/java/org/oxycblt/musikr/fs/Format.kt
index 3652a80df..113bd3583 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/fs/Format.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/fs/Format.kt
@@ -84,7 +84,7 @@ sealed interface Format {
                 "audio/wave" to Wav,
             )
 
-        fun infer(containerMimeType: String, codecMimeType: String): Format {
+        internal fun infer(containerMimeType: String, codecMimeType: String): Format {
             val codecFormat = CODEC_MAP[codecMimeType]
             if (codecFormat != null) {
                 // Codec found, possibly wrap in container.
diff --git a/musikr/src/main/java/org/oxycblt/musikr/fs/MusicLocation.kt b/musikr/src/main/java/org/oxycblt/musikr/fs/MusicLocation.kt
index d1e5e6235..87c6802af 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/fs/MusicLocation.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/fs/MusicLocation.kt
@@ -26,7 +26,7 @@ import org.oxycblt.musikr.fs.path.DocumentPathFactory
 import org.oxycblt.musikr.fs.query.contentResolverSafe
 import org.oxycblt.musikr.util.splitEscaped
 
-class MusicLocation internal constructor(val uri: Uri, val path: Path) {
+class MusicLocation private constructor(internal val uri: Uri, internal val path: Path) {
     override fun equals(other: Any?) = other is MusicLocation && uri == other.uri
 
     override fun hashCode() = 31 * uri.hashCode()
diff --git a/musikr/src/main/java/org/oxycblt/musikr/fs/Path.kt b/musikr/src/main/java/org/oxycblt/musikr/fs/Path.kt
index 731ea5847..ef6252294 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/fs/Path.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/fs/Path.kt
@@ -47,14 +47,14 @@ data class Path(
      * @param fileName The name of the file to append to the path.
      * @return The new [Path] instance.
      */
-    fun file(fileName: String) = Path(volume, components.child(fileName))
+    internal fun file(fileName: String) = Path(volume, components.child(fileName))
 
     /**
      * Resolves the [Path] in a human-readable format.
      *
      * @param context [Context] required to obtain human-readable strings.
      */
-    fun resolve(context: Context) = "${volume.resolveName(context)}/$components"
+    internal fun resolve(context: Context) = "${volume.resolveName(context)}/$components"
 }
 
 sealed interface Volume {
@@ -154,9 +154,7 @@ value class Components private constructor(val components: List<String>) {
 
     fun containing(other: Components) = Components(other.components.drop(components.size))
 
-    companion object {
-        fun nil() = Components(listOf())
-
+    internal companion object {
         /**
          * Parses a path string into a [Components] instance by the unix path separator (/).
          *
diff --git a/musikr/src/main/java/org/oxycblt/musikr/fs/path/DocumentPathFactory.kt b/musikr/src/main/java/org/oxycblt/musikr/fs/path/DocumentPathFactory.kt
index 60582fb02..de1cb6a28 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/fs/path/DocumentPathFactory.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/fs/path/DocumentPathFactory.kt
@@ -34,7 +34,7 @@ import org.oxycblt.musikr.fs.query.useQuery
  *
  * @author Alexander Capehart (OxygenCobalt)
  */
-interface DocumentPathFactory {
+internal interface DocumentPathFactory {
     /**
      * Unpacks a document URI into a [Path] instance, using [fromDocumentId].
      *
diff --git a/musikr/src/main/java/org/oxycblt/musikr/fs/path/MediaStorePathInterpreter.kt b/musikr/src/main/java/org/oxycblt/musikr/fs/path/MediaStorePathInterpreter.kt
index 59e14f111..d62d1cb45 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/fs/path/MediaStorePathInterpreter.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/fs/path/MediaStorePathInterpreter.kt
@@ -29,7 +29,7 @@ import org.oxycblt.musikr.fs.Path
  *
  * @author Alexander Capehart (OxygenCobalt)
  */
-sealed interface MediaStorePathInterpreter {
+internal sealed interface MediaStorePathInterpreter {
     /**
      * Extract a [Path] from the wrapped [Cursor]. This should be called after the cursor has been
      * moved to the row that should be interpreted.
diff --git a/musikr/src/main/java/org/oxycblt/musikr/fs/path/VolumeCompat.kt b/musikr/src/main/java/org/oxycblt/musikr/fs/path/VolumeCompat.kt
index ea3ed43db..2c0b87453 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/fs/path/VolumeCompat.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/fs/path/VolumeCompat.kt
@@ -46,7 +46,7 @@ private val svApi21GetPathMethod: Method by lazyReflectedMethod(StorageVolume::c
  *
  * @see StorageManager.getStorageVolumes
  */
-val StorageManager.storageVolumesCompat: List<StorageVolume>
+internal val StorageManager.storageVolumesCompat: List<StorageVolume>
     get() = storageVolumes.toList()
 
 /**
@@ -55,7 +55,7 @@ val StorageManager.storageVolumesCompat: List<StorageVolume>
  *
  * @see StorageVolume.getDirectory
  */
-val StorageVolume.directoryCompat: String?
+internal val StorageVolume.directoryCompat: String?
     @SuppressLint("NewApi")
     get() =
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
@@ -76,7 +76,7 @@ val StorageVolume.directoryCompat: String?
  * @return A human-readable name for this volume.
  */
 @SuppressLint("NewApi")
-fun StorageVolume.getDescriptionCompat(context: Context): String = getDescription(context)
+internal fun StorageVolume.getDescriptionCompat(context: Context): String = getDescription(context)
 
 /**
  * If this [StorageVolume] is considered the "Primary" volume where the Android System is kept. May
@@ -84,7 +84,7 @@ fun StorageVolume.getDescriptionCompat(context: Context): String = getDescriptio
  *
  * @see StorageVolume.isPrimary
  */
-val StorageVolume.isPrimaryCompat: Boolean
+internal val StorageVolume.isPrimaryCompat: Boolean
     @SuppressLint("NewApi") get() = isPrimary
 
 /**
@@ -93,14 +93,14 @@ val StorageVolume.isPrimaryCompat: Boolean
  *
  * @see StorageVolume.isEmulated
  */
-val StorageVolume.isEmulatedCompat: Boolean
+internal val StorageVolume.isEmulatedCompat: Boolean
     @SuppressLint("NewApi") get() = isEmulated
 
 /**
  * If this [StorageVolume] represents the "Internal Shared Storage" volume, also known as "primary"
  * to [MediaStore] and Document [Uri]s, obtained in a version compatible manner.
  */
-val StorageVolume.isInternalCompat: Boolean
+internal val StorageVolume.isInternalCompat: Boolean
     // Must contain the android system AND be an emulated drive, as non-emulated system
     // volumes use their UUID instead of primary in MediaStore/Document URIs.
     get() = isPrimaryCompat && isEmulatedCompat
@@ -111,7 +111,7 @@ val StorageVolume.isInternalCompat: Boolean
  *
  * @see StorageVolume.getUuid
  */
-val StorageVolume.uuidCompat: String?
+internal val StorageVolume.uuidCompat: String?
     @SuppressLint("NewApi") get() = uuid
 
 /**
@@ -120,7 +120,7 @@ val StorageVolume.uuidCompat: String?
  *
  * @see StorageVolume.getState
  */
-val StorageVolume.stateCompat: String
+internal val StorageVolume.stateCompat: String
     @SuppressLint("NewApi") get() = state
 
 /**
@@ -129,7 +129,7 @@ val StorageVolume.stateCompat: String
  *
  * @see StorageVolume.getMediaStoreVolumeName
  */
-val StorageVolume.mediaStoreVolumeNameCompat: String?
+internal val StorageVolume.mediaStoreVolumeNameCompat: String?
     get() =
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
             mediaStoreVolumeName
diff --git a/musikr/src/main/java/org/oxycblt/musikr/fs/path/VolumeManager.kt b/musikr/src/main/java/org/oxycblt/musikr/fs/path/VolumeManager.kt
index bfc1325ef..3e67ef5f7 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/fs/path/VolumeManager.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/fs/path/VolumeManager.kt
@@ -25,7 +25,7 @@ import org.oxycblt.musikr.fs.Components
 import org.oxycblt.musikr.fs.Volume
 
 /** A wrapper around [StorageManager] that provides instances of the [Volume] interface. */
-interface VolumeManager {
+internal interface VolumeManager {
     /**
      * The internal storage volume of the device.
      *
diff --git a/musikr/src/main/java/org/oxycblt/musikr/fs/query/DeviceFiles.kt b/musikr/src/main/java/org/oxycblt/musikr/fs/query/DeviceFiles.kt
index 6edd4fe68..596801551 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/fs/query/DeviceFiles.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/fs/query/DeviceFiles.kt
@@ -29,10 +29,11 @@ import kotlinx.coroutines.flow.emitAll
 import kotlinx.coroutines.flow.flatMapMerge
 import kotlinx.coroutines.flow.flattenMerge
 import kotlinx.coroutines.flow.flow
+import org.oxycblt.musikr.fs.DeviceFile
 import org.oxycblt.musikr.fs.MusicLocation
 import org.oxycblt.musikr.fs.Path
 
-interface DeviceFiles {
+internal interface DeviceFiles {
     fun explore(locations: Flow<MusicLocation>): Flow<DeviceFile>
 
     companion object {
@@ -40,14 +41,6 @@ interface DeviceFiles {
     }
 }
 
-data class DeviceFile(
-    val uri: Uri,
-    val mimeType: String,
-    val path: Path,
-    val size: Long,
-    val lastModified: Long
-)
-
 @OptIn(ExperimentalCoroutinesApi::class)
 private class DeviceFilesImpl(private val contentResolver: ContentResolver) : DeviceFiles {
     override fun explore(locations: Flow<MusicLocation>): Flow<DeviceFile> =
@@ -99,7 +92,8 @@ private class DeviceFilesImpl(private val contentResolver: ContentResolver) : De
                                 mimeType,
                                 newPath,
                                 size,
-                                lastModified))
+                                lastModified)
+                        )
                     }
                 }
                 emitAll(recursive.asFlow().flattenMerge())
diff --git a/musikr/src/main/java/org/oxycblt/musikr/fs/query/QueryUtil.kt b/musikr/src/main/java/org/oxycblt/musikr/fs/query/QueryUtil.kt
index 15b139506..14a05edc4 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/fs/query/QueryUtil.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/fs/query/QueryUtil.kt
@@ -27,7 +27,7 @@ import android.net.Uri
  * Get a content resolver that will not mangle MediaStore queries on certain devices. See
  * https://github.com/OxygenCobalt/Auxio/issues/50 for more info.
  */
-val Context.contentResolverSafe: ContentResolver
+internal val Context.contentResolverSafe: ContentResolver
     get() = applicationContext.contentResolver
 
 /**
@@ -42,7 +42,7 @@ val Context.contentResolverSafe: ContentResolver
  * @throws IllegalStateException If the [ContentResolver] did not return the queried [Cursor].
  * @see ContentResolver.query
  */
-fun ContentResolver.safeQuery(
+internal fun ContentResolver.safeQuery(
     uri: Uri,
     projection: Array<out String>,
     selector: String? = null,
@@ -63,7 +63,7 @@ fun ContentResolver.safeQuery(
  * @throws IllegalStateException If the [ContentResolver] did not return the queried [Cursor].
  * @see ContentResolver.query
  */
-inline fun <reified R> ContentResolver.useQuery(
+internal inline fun <reified R> ContentResolver.useQuery(
     uri: Uri,
     projection: Array<out String>,
     selector: String? = null,
diff --git a/musikr/src/main/java/org/oxycblt/musikr/graph/MusicGraph.kt b/musikr/src/main/java/org/oxycblt/musikr/graph/MusicGraph.kt
index 3aaed1d23..6b93c3dff 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/graph/MusicGraph.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/graph/MusicGraph.kt
@@ -25,7 +25,7 @@ import org.oxycblt.musikr.tag.interpret.PreGenre
 import org.oxycblt.musikr.tag.interpret.PreSong
 import org.oxycblt.musikr.util.unlikelyToBeNull
 
-data class MusicGraph(
+internal data class MusicGraph(
     val songVertex: List<SongVertex>,
     val albumVertex: List<AlbumVertex>,
     val artistVertex: List<ArtistVertex>,
@@ -274,7 +274,7 @@ private class MusicGraphBuilderImpl : MusicGraph.Builder {
     }
 }
 
-class SongVertex(
+internal class SongVertex(
     val preSong: PreSong,
     var albumVertex: AlbumVertex,
     var artistVertices: MutableList<ArtistVertex>,
@@ -283,12 +283,12 @@ class SongVertex(
     var tag: Any? = null
 }
 
-class AlbumVertex(val preAlbum: PreAlbum, var artistVertices: MutableList<ArtistVertex>) {
+internal class AlbumVertex(val preAlbum: PreAlbum, var artistVertices: MutableList<ArtistVertex>) {
     val songVertices = mutableSetOf<SongVertex>()
     var tag: Any? = null
 }
 
-class ArtistVertex(
+internal class ArtistVertex(
     val preArtist: PreArtist,
 ) {
     val songVertices = mutableSetOf<SongVertex>()
@@ -297,7 +297,7 @@ class ArtistVertex(
     var tag: Any? = null
 }
 
-class GenreVertex(val preGenre: PreGenre) {
+internal class GenreVertex(val preGenre: PreGenre) {
     val songVertices = mutableSetOf<SongVertex>()
     val artistVertices = mutableSetOf<ArtistVertex>()
     var tag: Any? = null
diff --git a/musikr/src/main/java/org/oxycblt/musikr/metadata/AndroidInputStream.kt b/musikr/src/main/java/org/oxycblt/musikr/metadata/AndroidInputStream.kt
index 03c6d1c83..1de192024 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/metadata/AndroidInputStream.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/metadata/AndroidInputStream.kt
@@ -22,7 +22,7 @@ import android.content.Context
 import java.io.FileInputStream
 import java.nio.ByteBuffer
 
-class AndroidInputStream(context: Context, fileRef: FileRef) : NativeInputStream {
+internal class AndroidInputStream(context: Context, fileRef: FileRef) : NativeInputStream {
     private val fileName = fileRef.fileName
     private val fd =
         requireNotNull(context.contentResolver.openFileDescriptor(fileRef.uri, "r")) {
diff --git a/musikr/src/main/java/org/oxycblt/musikr/metadata/Metadata.kt b/musikr/src/main/java/org/oxycblt/musikr/metadata/Metadata.kt
new file mode 100644
index 000000000..ab034844e
--- /dev/null
+++ b/musikr/src/main/java/org/oxycblt/musikr/metadata/Metadata.kt
@@ -0,0 +1,43 @@
+package org.oxycblt.musikr.metadata
+
+internal data class Metadata(
+    val id3v2: Map<String, List<String>>,
+    val xiph: Map<String, List<String>>,
+    val mp4: Map<String, List<String>>,
+    val cover: ByteArray?,
+    val properties: Properties
+) {
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (javaClass != other?.javaClass) return false
+
+        other as Metadata
+
+        if (id3v2 != other.id3v2) return false
+        if (xiph != other.xiph) return false
+        if (mp4 != other.mp4) return false
+        if (cover != null) {
+            if (other.cover == null) return false
+            if (!cover.contentEquals(other.cover)) return false
+        } else if (other.cover != null) return false
+        if (properties != other.properties) return false
+
+        return true
+    }
+
+    override fun hashCode(): Int {
+        var result = id3v2.hashCode()
+        result = 31 * result + xiph.hashCode()
+        result = 31 * result + mp4.hashCode()
+        result = 31 * result + (cover?.contentHashCode() ?: 0)
+        result = 31 * result + properties.hashCode()
+        return result
+    }
+}
+
+data class Properties(
+    val mimeType: String,
+    val durationMs: Long,
+    val bitrate: Int,
+    val sampleRate: Int,
+)
diff --git a/musikr/src/main/java/org/oxycblt/musikr/metadata/MetadataExtractor.kt b/musikr/src/main/java/org/oxycblt/musikr/metadata/MetadataExtractor.kt
index 40d572fb8..59d1b0c7d 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/metadata/MetadataExtractor.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/metadata/MetadataExtractor.kt
@@ -21,10 +21,10 @@ package org.oxycblt.musikr.metadata
 import android.content.Context
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.withContext
-import org.oxycblt.musikr.fs.query.DeviceFile
+import org.oxycblt.musikr.fs.DeviceFile
 import org.oxycblt.musikr.util.unlikelyToBeNull
 
-interface MetadataExtractor {
+internal interface MetadataExtractor {
     suspend fun extract(file: DeviceFile): Metadata?
 
     companion object {
diff --git a/musikr/src/main/java/org/oxycblt/musikr/metadata/NativeInputStream.kt b/musikr/src/main/java/org/oxycblt/musikr/metadata/NativeInputStream.kt
index 66e63c454..1b2382647 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/metadata/NativeInputStream.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/metadata/NativeInputStream.kt
@@ -23,7 +23,7 @@ package org.oxycblt.musikr.metadata
  *
  * The vast majority of IO shim between Taglib/KTaglib should occur here to minimize JNI calls.
  */
-interface NativeInputStream {
+internal interface NativeInputStream {
     fun name(): String
 
     fun readBlock(length: Long): ByteArray
diff --git a/musikr/src/main/java/org/oxycblt/musikr/metadata/TagLibJNI.kt b/musikr/src/main/java/org/oxycblt/musikr/metadata/TagLibJNI.kt
index 45ac2be9b..12124a65d 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/metadata/TagLibJNI.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/metadata/TagLibJNI.kt
@@ -21,7 +21,7 @@ package org.oxycblt.musikr.metadata
 import android.content.Context
 import android.net.Uri
 
-object TagLibJNI {
+internal object TagLibJNI {
     init {
         System.loadLibrary("taglib_jni")
     }
@@ -41,46 +41,4 @@ object TagLibJNI {
     private external fun openNative(ioStream: AndroidInputStream): Metadata?
 }
 
-data class FileRef(val fileName: String, val uri: Uri)
-
-data class Metadata(
-    val id3v2: Map<String, List<String>>,
-    val xiph: Map<String, List<String>>,
-    val mp4: Map<String, List<String>>,
-    val cover: ByteArray?,
-    val properties: Properties
-) {
-    override fun equals(other: Any?): Boolean {
-        if (this === other) return true
-        if (javaClass != other?.javaClass) return false
-
-        other as Metadata
-
-        if (id3v2 != other.id3v2) return false
-        if (xiph != other.xiph) return false
-        if (mp4 != other.mp4) return false
-        if (cover != null) {
-            if (other.cover == null) return false
-            if (!cover.contentEquals(other.cover)) return false
-        } else if (other.cover != null) return false
-        if (properties != other.properties) return false
-
-        return true
-    }
-
-    override fun hashCode(): Int {
-        var result = id3v2.hashCode()
-        result = 31 * result + xiph.hashCode()
-        result = 31 * result + mp4.hashCode()
-        result = 31 * result + (cover?.contentHashCode() ?: 0)
-        result = 31 * result + properties.hashCode()
-        return result
-    }
-}
-
-data class Properties(
-    val mimeType: String,
-    val durationMs: Long,
-    val bitrate: Int,
-    val sampleRate: Int,
-)
+internal data class FileRef(val fileName: String, val uri: Uri)
diff --git a/musikr/src/main/java/org/oxycblt/musikr/model/AlbumImpl.kt b/musikr/src/main/java/org/oxycblt/musikr/model/AlbumImpl.kt
index 02148c876..19be4885c 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/model/AlbumImpl.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/model/AlbumImpl.kt
@@ -27,7 +27,7 @@ import org.oxycblt.musikr.tag.Date
 import org.oxycblt.musikr.tag.interpret.PreAlbum
 import org.oxycblt.musikr.util.update
 
-interface AlbumCore {
+internal interface AlbumCore {
     val preAlbum: PreAlbum
     val songs: List<Song>
 
@@ -39,7 +39,7 @@ interface AlbumCore {
  *
  * @author Alexander Capehart (OxygenCobalt)
  */
-class AlbumImpl(private val core: AlbumCore) : Album {
+internal class AlbumImpl(private val core: AlbumCore) : Album {
     private val preAlbum = core.preAlbum
 
     override val uid =
diff --git a/musikr/src/main/java/org/oxycblt/musikr/model/ArtistImpl.kt b/musikr/src/main/java/org/oxycblt/musikr/model/ArtistImpl.kt
index f37f6c264..4a2ca3990 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/model/ArtistImpl.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/model/ArtistImpl.kt
@@ -27,7 +27,7 @@ import org.oxycblt.musikr.cover.Cover
 import org.oxycblt.musikr.tag.interpret.PreArtist
 import org.oxycblt.musikr.util.update
 
-interface ArtistCore {
+internal interface ArtistCore {
     val preArtist: PreArtist
     val songs: Set<Song>
     val albums: Set<Album>
@@ -40,7 +40,7 @@ interface ArtistCore {
  *
  * @author Alexander Capehart (OxygenCobalt)
  */
-class ArtistImpl(private val core: ArtistCore) : Artist {
+internal class ArtistImpl(private val core: ArtistCore) : Artist {
     override val uid =
         // Attempt to use a MusicBrainz ID first before falling back to a hashed UID.
         core.preArtist.musicBrainzId?.let { Music.UID.musicBrainz(Music.UID.Item.ARTIST, it) }
diff --git a/musikr/src/main/java/org/oxycblt/musikr/model/GenreImpl.kt b/musikr/src/main/java/org/oxycblt/musikr/model/GenreImpl.kt
index 8fa91f4e0..cb696a696 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/model/GenreImpl.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/model/GenreImpl.kt
@@ -26,7 +26,7 @@ import org.oxycblt.musikr.cover.Cover
 import org.oxycblt.musikr.tag.interpret.PreGenre
 import org.oxycblt.musikr.util.update
 
-interface GenreCore {
+internal interface GenreCore {
     val preGenre: PreGenre
     val songs: Set<Song>
     val artists: Set<Artist>
@@ -37,7 +37,7 @@ interface GenreCore {
  *
  * @author Alexander Capehart (OxygenCobalt)
  */
-class GenreImpl(private val core: GenreCore) : Genre {
+internal class GenreImpl(private val core: GenreCore) : Genre {
     override val uid = Music.UID.auxio(Music.UID.Item.GENRE) { update(core.preGenre.rawName) }
     override val name = core.preGenre.name
 
diff --git a/musikr/src/main/java/org/oxycblt/musikr/model/LibraryFactory.kt b/musikr/src/main/java/org/oxycblt/musikr/model/LibraryFactory.kt
index 37d8ebc41..bdadcfc7d 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/model/LibraryFactory.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/model/LibraryFactory.kt
@@ -29,7 +29,7 @@ import org.oxycblt.musikr.graph.GenreVertex
 import org.oxycblt.musikr.graph.MusicGraph
 import org.oxycblt.musikr.graph.SongVertex
 
-interface LibraryFactory {
+internal interface LibraryFactory {
     fun create(graph: MusicGraph): MutableLibrary
 
     companion object {
diff --git a/musikr/src/main/java/org/oxycblt/musikr/model/LibraryImpl.kt b/musikr/src/main/java/org/oxycblt/musikr/model/LibraryImpl.kt
index f3d5a08d9..3e067b57e 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/model/LibraryImpl.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/model/LibraryImpl.kt
@@ -24,7 +24,7 @@ import org.oxycblt.musikr.Playlist
 import org.oxycblt.musikr.Song
 import org.oxycblt.musikr.fs.Path
 
-class LibraryImpl(
+internal class LibraryImpl(
     override val songs: Collection<SongImpl>,
     override val albums: Collection<AlbumImpl>,
     override val artists: Collection<ArtistImpl>,
diff --git a/musikr/src/main/java/org/oxycblt/musikr/model/PlaylistImpl.kt b/musikr/src/main/java/org/oxycblt/musikr/model/PlaylistImpl.kt
index ac1e2cefe..16259b613 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/model/PlaylistImpl.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/model/PlaylistImpl.kt
@@ -25,13 +25,13 @@ import org.oxycblt.musikr.playlist.PlaylistHandle
 import org.oxycblt.musikr.tag.Name
 import org.oxycblt.musikr.tag.interpret.PrePlaylist
 
-interface PlaylistCore {
+internal interface PlaylistCore {
     val prePlaylist: PrePlaylist
     val handle: PlaylistHandle
     val songs: List<Song>
 }
 
-class PlaylistImpl(private val core: PlaylistCore) : Playlist {
+internal class PlaylistImpl(private val core: PlaylistCore) : Playlist {
     override val uid = core.handle.uid
     override val name: Name.Known = core.prePlaylist.name
     override val durationMs = core.songs.sumOf { it.durationMs }
diff --git a/musikr/src/main/java/org/oxycblt/musikr/model/SongImpl.kt b/musikr/src/main/java/org/oxycblt/musikr/model/SongImpl.kt
index 8a49d3dda..cc9aac807 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/model/SongImpl.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/model/SongImpl.kt
@@ -24,7 +24,7 @@ import org.oxycblt.musikr.Genre
 import org.oxycblt.musikr.Song
 import org.oxycblt.musikr.tag.interpret.PreSong
 
-interface SongCore {
+internal interface SongCore {
     val preSong: PreSong
 
     fun resolveAlbum(): Album
@@ -39,7 +39,7 @@ interface SongCore {
  *
  * @author Alexander Capehart (OxygenCobalt)
  */
-class SongImpl(private val handle: SongCore) : Song {
+internal class SongImpl(private val handle: SongCore) : Song {
     private val preSong = handle.preSong
 
     override val uid = preSong.computeUid()
diff --git a/musikr/src/main/java/org/oxycblt/musikr/pipeline/EvaluateStep.kt b/musikr/src/main/java/org/oxycblt/musikr/pipeline/EvaluateStep.kt
index 6dd6b5d83..fccee6ee9 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/pipeline/EvaluateStep.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/pipeline/EvaluateStep.kt
@@ -31,7 +31,7 @@ import org.oxycblt.musikr.graph.MusicGraph
 import org.oxycblt.musikr.model.LibraryFactory
 import org.oxycblt.musikr.tag.interpret.TagInterpreter
 
-interface EvaluateStep {
+internal interface EvaluateStep {
     suspend fun evaluate(
         interpretation: Interpretation,
         extractedMusic: Flow<ExtractedMusic>
diff --git a/musikr/src/main/java/org/oxycblt/musikr/pipeline/ExploreStep.kt b/musikr/src/main/java/org/oxycblt/musikr/pipeline/ExploreStep.kt
index e73ca2cea..a011d3f98 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/pipeline/ExploreStep.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/pipeline/ExploreStep.kt
@@ -25,11 +25,11 @@ import kotlinx.coroutines.flow.asFlow
 import kotlinx.coroutines.flow.flowOn
 import kotlinx.coroutines.flow.mapNotNull
 import org.oxycblt.musikr.fs.MusicLocation
-import org.oxycblt.musikr.fs.query.DeviceFile
+import org.oxycblt.musikr.fs.DeviceFile
 import org.oxycblt.musikr.fs.query.DeviceFiles
 import org.oxycblt.musikr.playlist.m3u.M3U
 
-interface ExploreStep {
+internal interface ExploreStep {
     fun explore(locations: List<MusicLocation>): Flow<ExploreNode>
 
     companion object {
@@ -51,6 +51,6 @@ private class ExploreStepImpl(private val deviceFiles: DeviceFiles) : ExploreSte
             .flowOn(Dispatchers.IO)
 }
 
-sealed interface ExploreNode {
+internal sealed interface ExploreNode {
     data class Audio(val file: DeviceFile) : ExploreNode
 }
diff --git a/musikr/src/main/java/org/oxycblt/musikr/pipeline/ExtractStep.kt b/musikr/src/main/java/org/oxycblt/musikr/pipeline/ExtractStep.kt
index f7a1f03ac..520f07130 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/pipeline/ExtractStep.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/pipeline/ExtractStep.kt
@@ -31,13 +31,13 @@ import kotlinx.coroutines.flow.merge
 import org.oxycblt.musikr.Storage
 import org.oxycblt.musikr.cache.CacheResult
 import org.oxycblt.musikr.cover.Cover
-import org.oxycblt.musikr.fs.query.DeviceFile
+import org.oxycblt.musikr.fs.DeviceFile
 import org.oxycblt.musikr.metadata.MetadataExtractor
 import org.oxycblt.musikr.metadata.Properties
 import org.oxycblt.musikr.tag.parse.ParsedTags
 import org.oxycblt.musikr.tag.parse.TagParser
 
-interface ExtractStep {
+internal interface ExtractStep {
     fun extract(storage: Storage, nodes: Flow<ExploreNode>): Flow<ExtractedMusic>
 
     companion object {
@@ -99,6 +99,6 @@ data class RawSong(
     val cover: Cover.Single?
 )
 
-sealed interface ExtractedMusic {
+internal sealed interface ExtractedMusic {
     data class Song(val song: RawSong) : ExtractedMusic
 }
diff --git a/musikr/src/main/java/org/oxycblt/musikr/pipeline/FlowUtil.kt b/musikr/src/main/java/org/oxycblt/musikr/pipeline/FlowUtil.kt
index a99c3f3c1..94d93c4c2 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/pipeline/FlowUtil.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/pipeline/FlowUtil.kt
@@ -25,7 +25,7 @@ import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.receiveAsFlow
 import kotlinx.coroutines.flow.withIndex
 
-sealed interface Divert<L, R> {
+internal sealed interface Divert<L, R> {
     data class Left<L, R>(val value: L) : Divert<L, R>
 
     data class Right<L, R>(val value: R) : Divert<L, R>
@@ -33,7 +33,7 @@ sealed interface Divert<L, R> {
 
 class DivertedFlow<L, R>(val manager: Flow<Nothing>, val left: Flow<L>, val right: Flow<R>)
 
-inline fun <T, L, R> Flow<T>.divert(
+internal inline fun <T, L, R> Flow<T>.divert(
     crossinline predicate: (T) -> Divert<L, R>
 ): DivertedFlow<L, R> {
     val leftChannel = Channel<L>(Channel.UNLIMITED)
@@ -52,7 +52,7 @@ inline fun <T, L, R> Flow<T>.divert(
     return DivertedFlow(managedFlow, leftChannel.receiveAsFlow(), rightChannel.receiveAsFlow())
 }
 
-class DistributedFlow<T>(val manager: Flow<Nothing>, val flows: Array<Flow<T>>)
+internal class DistributedFlow<T>(val manager: Flow<Nothing>, val flows: Array<Flow<T>>)
 
 /**
  * Equally "distributes" the values of some flow across n new flows.
@@ -60,7 +60,7 @@ class DistributedFlow<T>(val manager: Flow<Nothing>, val flows: Array<Flow<T>>)
  * Note that this function requires the "manager" flow to be consumed alongside the split flows in
  * order to function. Without this, all of the newly split flows will simply block.
  */
-fun <T> Flow<T>.distribute(n: Int): DistributedFlow<T> {
+internal fun <T> Flow<T>.distribute(n: Int): DistributedFlow<T> {
     val posChannels = Array(n) { Channel<T>(Channel.UNLIMITED) }
     val managerFlow =
         flow<Nothing> {
diff --git a/musikr/src/main/java/org/oxycblt/musikr/playlist/ExternalPlaylistManager.kt b/musikr/src/main/java/org/oxycblt/musikr/playlist/ExternalPlaylistManager.kt
index e4fe86dcc..0e6ecf179 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/playlist/ExternalPlaylistManager.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/playlist/ExternalPlaylistManager.kt
@@ -84,7 +84,7 @@ data class ImportedPlaylist(val name: String?, val paths: List<PossiblePaths>)
 
 typealias PossiblePaths = List<Path>
 
-class ExternalPlaylistManagerImpl(
+private class ExternalPlaylistManagerImpl(
     private val context: Context,
     private val documentPathFactory: DocumentPathFactory,
     private val m3u: M3U
diff --git a/musikr/src/main/java/org/oxycblt/musikr/tag/format/ID3.kt b/musikr/src/main/java/org/oxycblt/musikr/tag/format/ID3.kt
index 3712fc166..4e9390711 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/tag/format/ID3.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/tag/format/ID3.kt
@@ -28,7 +28,7 @@ package org.oxycblt.musikr.tag.format
  * @return A list of one or more genre names, or null if this multi-value list has no valid
  *   formatting.
  */
-fun List<String>.parseId3GenreNames() =
+internal fun List<String>.parseId3GenreNames() =
     if (size == 1) {
         first().parseId3MultiValueGenre()
     } else {
diff --git a/musikr/src/main/java/org/oxycblt/musikr/tag/format/Vorbis.kt b/musikr/src/main/java/org/oxycblt/musikr/tag/format/Vorbis.kt
index 05c3e2793..51e58ce70 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/tag/format/Vorbis.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/tag/format/Vorbis.kt
@@ -30,7 +30,7 @@ import org.oxycblt.musikr.util.positiveOrNull
  *
  * @see transformPositionField
  */
-fun String.parseId3v2PositionField() =
+internal fun String.parseId3v2PositionField() =
     split('/', limit = 2).let {
         transformPositionField(it[0].toIntOrNull(), it.getOrNull(1)?.toIntOrNull())
     }
@@ -47,7 +47,7 @@ fun String.parseId3v2PositionField() =
  *
  * @see transformPositionField
  */
-fun parseXiphPositionField(pos: String?, total: String?) =
+internal fun parseXiphPositionField(pos: String?, total: String?) =
     transformPositionField(pos?.toIntOrNull(), total?.toIntOrNull())
 
 /**
@@ -59,7 +59,7 @@ fun parseXiphPositionField(pos: String?, total: String?) =
  * - The position could not be parsed
  * - The position was zeroed AND the total value was not present/zeroed
  */
-fun transformPositionField(pos: Int?, total: Int?) =
+internal fun transformPositionField(pos: Int?, total: Int?) =
     if (pos != null && (pos > 0 || (total?.positiveOrNull() != null))) {
         pos
     } else {
diff --git a/musikr/src/main/java/org/oxycblt/musikr/tag/interpret/PreMusic.kt b/musikr/src/main/java/org/oxycblt/musikr/tag/interpret/PreMusic.kt
index 8da604f6a..b977fa562 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/tag/interpret/PreMusic.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/tag/interpret/PreMusic.kt
@@ -32,7 +32,7 @@ import org.oxycblt.musikr.tag.ReleaseType
 import org.oxycblt.musikr.tag.ReplayGainAdjustment
 import org.oxycblt.musikr.util.update
 
-data class PreSong(
+internal data class PreSong(
     val musicBrainzId: UUID?,
     val name: Name.Known,
     val rawName: String,
@@ -70,7 +70,7 @@ data class PreSong(
             }
 }
 
-data class PreAlbum(
+internal data class PreAlbum(
     val musicBrainzId: UUID?,
     val name: Name,
     val rawName: String?,
@@ -78,11 +78,11 @@ data class PreAlbum(
     val preArtists: List<PreArtist>
 )
 
-data class PreArtist(val musicBrainzId: UUID?, val name: Name, val rawName: String?)
+internal data class PreArtist(val musicBrainzId: UUID?, val name: Name, val rawName: String?)
 
-data class PreGenre(
+internal data class PreGenre(
     val name: Name,
     val rawName: String?,
 )
 
-data class PrePlaylist(val name: Name.Known, val rawName: String?, val handle: PlaylistHandle)
+internal data class PrePlaylist(val name: Name.Known, val rawName: String?, val handle: PlaylistHandle)
diff --git a/musikr/src/main/java/org/oxycblt/musikr/tag/interpret/TagInterpreter.kt b/musikr/src/main/java/org/oxycblt/musikr/tag/interpret/TagInterpreter.kt
index 89de7fd62..44d1448b3 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/tag/interpret/TagInterpreter.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/tag/interpret/TagInterpreter.kt
@@ -30,7 +30,7 @@ import org.oxycblt.musikr.tag.parse.ParsedTags
 import org.oxycblt.musikr.tag.format.parseId3GenreNames
 import org.oxycblt.musikr.util.toUuidOrNull
 
-interface TagInterpreter {
+internal interface TagInterpreter {
     fun interpret(song: RawSong, interpretation: Interpretation): PreSong
 
     companion object {
diff --git a/musikr/src/main/java/org/oxycblt/musikr/tag/interpret/Token.kt b/musikr/src/main/java/org/oxycblt/musikr/tag/interpret/Token.kt
index 749b6c5e5..c09ba3521 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/tag/interpret/Token.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/tag/interpret/Token.kt
@@ -21,7 +21,9 @@ package org.oxycblt.musikr.tag.interpret
 import java.text.CollationKey
 
 /** An individual part of a name string that can be compared intelligently. */
-data class Token(val collationKey: CollationKey, val type: Type) : Comparable<Token> {
+data class Token(internal val collationKey: CollationKey, internal val type: Type) : Comparable<Token> {
+    val value: String get() = collationKey.sourceString
+
     override fun compareTo(other: Token): Int {
         // Numeric tokens should always be lower than lexicographic tokens.
         val modeComp = type.compareTo(other.type)
diff --git a/musikr/src/main/java/org/oxycblt/musikr/tag/parse/ExoPlayerTagFields.kt b/musikr/src/main/java/org/oxycblt/musikr/tag/parse/TagFields.kt
similarity index 87%
rename from musikr/src/main/java/org/oxycblt/musikr/tag/parse/ExoPlayerTagFields.kt
rename to musikr/src/main/java/org/oxycblt/musikr/tag/parse/TagFields.kt
index 23ea14a18..a35ed1205 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/tag/parse/ExoPlayerTagFields.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/tag/parse/TagFields.kt
@@ -1,6 +1,6 @@
 /*
  * Copyright (c) 2024 Auxio Project
- * ExoPlayerTagFields.kt is part of Auxio.
+ * TagFields.kt is part of Auxio.
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -26,32 +26,32 @@ import org.oxycblt.musikr.tag.format.parseXiphPositionField
 import org.oxycblt.musikr.util.nonZeroOrNull
 
 // Song
-fun Metadata.musicBrainzId() =
+internal fun Metadata.musicBrainzId() =
     (xiph["MUSICBRAINZ_RELEASETRACKID"]
             ?: xiph["MUSICBRAINZ RELEASE TRACK ID"]
             ?: id3v2["TXXX:MUSICBRAINZ RELEASE TRACK ID"]
             ?: id3v2["TXXX:MUSICBRAINZ_RELEASETRACKID"])
         ?.first()
 
-fun Metadata.name() = (xiph["TITLE"] ?: id3v2["TIT2"])?.first()
+internal fun Metadata.name() = (xiph["TITLE"] ?: id3v2["TIT2"])?.first()
 
-fun Metadata.sortName() = (xiph["TITLESORT"] ?: id3v2["TSOT"])?.first()
+internal fun Metadata.sortName() = (xiph["TITLESORT"] ?: id3v2["TSOT"])?.first()
 
 // Track.
-fun Metadata.track() =
+internal fun Metadata.track() =
     (parseXiphPositionField(
         xiph["TRACKNUMBER"]?.first(),
         (xiph["TOTALTRACKS"] ?: xiph["TRACKTOTAL"] ?: xiph["TRACKC"])?.first())
         ?: id3v2["TRCK"]?.run { first().parseId3v2PositionField() })
 
 // Disc and it's subtitle name.
-fun Metadata.disc() =
+internal fun Metadata.disc() =
     (parseXiphPositionField(
         xiph["DISCNUMBER"]?.first(),
         (xiph["TOTALDISCS"] ?: xiph["DISCTOTAL"] ?: xiph["DISCC"])?.run { first() })
         ?: id3v2["TPOS"]?.run { first().parseId3v2PositionField() })
 
-fun Metadata.subtitle() = (xiph["DISCSUBTITLE"] ?: id3v2["TSST"])?.first()
+internal fun Metadata.subtitle() = (xiph["DISCSUBTITLE"] ?: id3v2["TSST"])?.first()
 
 // Dates are somewhat complicated, as not only did their semantics change from a flat year
 // value in ID3v2.3 to a full ISO-8601 date in ID3v2.4, but there are also a variety of
@@ -65,7 +65,7 @@ fun Metadata.subtitle() = (xiph["DISCSUBTITLE"] ?: id3v2["TSST"])?.first()
 // TODO: Show original and normal dates side-by-side
 // TODO: Handle dates that are in "January" because the actual specific release date
 //  isn't known?
-fun Metadata.date() =
+internal fun Metadata.date() =
     (xiph["ORIGINALDATE"]?.run { Date.from(first()) }
         ?: xiph["DATE"]?.run { Date.from(first()) }
         ?: xiph["YEAR"]?.run { Date.from(first()) }
@@ -83,18 +83,18 @@ fun Metadata.date() =
         ?: parseId3v23Date())
 
 // Album
-fun Metadata.albumMusicBrainzId() =
+internal fun Metadata.albumMusicBrainzId() =
     (xiph["MUSICBRAINZ_ALBUMID"]
             ?: xiph["MUSICBRAINZ ALBUM ID"]
             ?: id3v2["TXXX:MUSICBRAINZ ALBUM ID"]
             ?: id3v2["TXXX:MUSICBRAINZ_ALBUMID"])
         ?.first()
 
-fun Metadata.albumName() = (xiph["ALBUM"] ?: id3v2["TALB"])?.first()
+internal fun Metadata.albumName() = (xiph["ALBUM"] ?: id3v2["TALB"])?.first()
 
-fun Metadata.albumSortName() = (xiph["ALBUMSORT"] ?: id3v2["TSOA"])?.first()
+internal fun Metadata.albumSortName() = (xiph["ALBUMSORT"] ?: id3v2["TSOA"])?.first()
 
-fun Metadata.releaseTypes() =
+internal fun Metadata.releaseTypes() =
     (xiph["RELEASETYPE"]
         ?: xiph["MUSICBRAINZ ALBUM TYPE"]
         ?: id3v2["TXXX:MUSICBRAINZ ALBUM TYPE"]
@@ -104,20 +104,20 @@ fun Metadata.releaseTypes() =
         id3v2["GRP1"])
 
 // Artist
-fun Metadata.artistMusicBrainzIds() =
+internal fun Metadata.artistMusicBrainzIds() =
     (xiph["MUSICBRAINZ_ARTISTID"]
         ?: xiph["MUSICBRAINZ ARTIST ID"]
         ?: id3v2["TXXX:MUSICBRAINZ ARTIST ID"]
         ?: id3v2["TXXX:MUSICBRAINZ_ARTISTID"])
 
-fun Metadata.artistNames() =
+internal fun Metadata.artistNames() =
     (xiph["ARTISTS"]
         ?: xiph["ARTIST"]
         ?: id3v2["TXXX:ARTISTS"]
         ?: id3v2["TPE1"]
         ?: id3v2["TXXX:ARTIST"])
 
-fun Metadata.artistSortNames() =
+internal fun Metadata.artistSortNames() =
     (xiph["ARTISTSSORT"]
         ?: xiph["ARTISTS_SORT"]
         ?: xiph["ARTISTS SORT"]
@@ -130,13 +130,13 @@ fun Metadata.artistSortNames() =
         ?: id3v2["TXXX:ARTISTSORT"]
         ?: id3v2["TXXX:ARTIST SORT"])
 
-fun Metadata.albumArtistMusicBrainzIds() =
+internal fun Metadata.albumArtistMusicBrainzIds() =
     (xiph["MUSICBRAINZ_ALBUMARTISTID"]
         ?: xiph["MUSICBRAINZ ALBUM ARTIST ID"]
         ?: id3v2["TXXX:MUSICBRAINZ ALBUM ARTIST ID"]
         ?: id3v2["TXXX:MUSICBRAINZ_ALBUMARTISTID"])
 
-fun Metadata.albumArtistNames() =
+internal fun Metadata.albumArtistNames() =
     (xiph["ALBUMARTISTS"]
         ?: xiph["ALBUM_ARTISTS"]
         ?: xiph["ALBUM ARTISTS"]
@@ -149,7 +149,7 @@ fun Metadata.albumArtistNames() =
         ?: id3v2["TXXX:ALBUMARTIST"]
         ?: id3v2["TXXX:ALBUM ARTIST"])
 
-fun Metadata.albumArtistSortNames() =
+internal fun Metadata.albumArtistSortNames() =
     (xiph["ALBUMARTISTSSORT"]
         ?: xiph["ALBUMARTISTS_SORT"]
         ?: xiph["ALBUMARTISTS SORT"]
@@ -164,10 +164,10 @@ fun Metadata.albumArtistSortNames() =
         ?: id3v2["TXXX:ALBUM ARTIST SORT"])
 
 // Genre
-fun Metadata.genreNames() = xiph["GENRE"] ?: id3v2["TCON"]
+internal fun Metadata.genreNames() = xiph["GENRE"] ?: id3v2["TCON"]
 
 // Compilation Flag
-fun Metadata.isCompilation() =
+internal fun Metadata.isCompilation() =
     (xiph["COMPILATION"]
             ?: xiph["ITUNESCOMPILATION"]
             ?: id3v2["TCMP"] // This is a non-standard itunes extension
@@ -179,16 +179,36 @@ fun Metadata.isCompilation() =
         }
 
 // ReplayGain information
-fun Metadata.replayGainTrackAdjustment() =
+internal fun Metadata.replayGainTrackAdjustment() =
     (xiph["R128_TRACK_GAIN"]?.parseR128Adjustment()
         ?: xiph["REPLAYGAIN_TRACK_GAIN"]?.parseReplayGainAdjustment()
         ?: id3v2["TXXX:REPLAYGAIN_TRACK_GAIN"]?.parseReplayGainAdjustment())
 
-fun Metadata.replayGainAlbumAdjustment() =
+internal fun Metadata.replayGainAlbumAdjustment() =
     (xiph["R128_ALBUM_GAIN"]?.parseR128Adjustment()
         ?: xiph["REPLAYGAIN_ALBUM_GAIN"]?.parseReplayGainAdjustment()
         ?: id3v2["TXXX:REPLAYGAIN_ALBUM_GAIN"]?.parseReplayGainAdjustment())
 
+private fun List<String>.parseR128Adjustment() =
+    first().replace(REPLAYGAIN_ADJUSTMENT_FILTER_REGEX, "").toFloatOrNull()?.nonZeroOrNull()?.run {
+        // Convert to fixed-point and adjust to LUFS 18 to match the ReplayGain scale
+        this / 256f + 5
+    }
+
+/**
+ * Parse a ReplayGain adjustment into a float value.
+ *
+ * @return A parsed adjustment float, or null if the adjustment had invalid formatting.
+ */
+private fun List<String>.parseReplayGainAdjustment() =
+    first().replace(REPLAYGAIN_ADJUSTMENT_FILTER_REGEX, "").toFloatOrNull()?.nonZeroOrNull()
+
+/**
+ * Matches non-float information from ReplayGain adjustments. Derived from vanilla music:
+ * https://github.com/vanilla-music/vanilla
+ */
+private val REPLAYGAIN_ADJUSTMENT_FILTER_REGEX by lazy { Regex("[^\\d.-]") }
+
 private fun Metadata.parseId3v23Date(): Date? {
     // Assume that TDAT/TIME can refer to TYER or TORY depending on if TORY
     // is present.
@@ -222,23 +242,3 @@ private fun Metadata.parseId3v23Date(): Date? {
         return Date.from(year)
     }
 }
-
-private fun List<String>.parseR128Adjustment() =
-    first().replace(REPLAYGAIN_ADJUSTMENT_FILTER_REGEX, "").toFloatOrNull()?.nonZeroOrNull()?.run {
-        // Convert to fixed-point and adjust to LUFS 18 to match the ReplayGain scale
-        this / 256f + 5
-    }
-
-/**
- * Parse a ReplayGain adjustment into a float value.
- *
- * @return A parsed adjustment float, or null if the adjustment had invalid formatting.
- */
-private fun List<String>.parseReplayGainAdjustment() =
-    first().replace(REPLAYGAIN_ADJUSTMENT_FILTER_REGEX, "").toFloatOrNull()?.nonZeroOrNull()
-
-/**
- * Matches non-float information from ReplayGain adjustments. Derived from vanilla music:
- * https://github.com/vanilla-music/vanilla
- */
-val REPLAYGAIN_ADJUSTMENT_FILTER_REGEX by lazy { Regex("[^\\d.-]") }
diff --git a/musikr/src/main/java/org/oxycblt/musikr/tag/parse/TagParser.kt b/musikr/src/main/java/org/oxycblt/musikr/tag/parse/TagParser.kt
index 14ecaf570..9bfce156d 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/tag/parse/TagParser.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/tag/parse/TagParser.kt
@@ -18,10 +18,10 @@
  
 package org.oxycblt.musikr.tag.parse
 
-import org.oxycblt.musikr.fs.query.DeviceFile
+import org.oxycblt.musikr.fs.DeviceFile
 import org.oxycblt.musikr.metadata.Metadata
 
-interface TagParser {
+internal interface TagParser {
     fun parse(file: DeviceFile, metadata: Metadata): ParsedTags
 
     companion object {
diff --git a/musikr/src/main/java/org/oxycblt/musikr/util/LangUtil.kt b/musikr/src/main/java/org/oxycblt/musikr/util/LangUtil.kt
index bae4960b9..d71e6b576 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/util/LangUtil.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/util/LangUtil.kt
@@ -29,7 +29,7 @@ import org.oxycblt.musikr.tag.Date
  * otherwise, it aliases to the unchecked dereference operator (!!). This can be used as a minor
  * optimization in certain cases.
  */
-fun <T> unlikelyToBeNull(value: T?) =
+internal fun <T> unlikelyToBeNull(value: T?) =
     if (BuildConfig.DEBUG) {
         requireNotNull(value)
     } else {
@@ -41,14 +41,14 @@ fun <T> unlikelyToBeNull(value: T?) =
  *
  * @return The given number if it's non-zero, null otherwise.
  */
-fun Int.positiveOrNull() = if (this > 0) this else null
+internal fun Int.positiveOrNull() = if (this > 0) this else null
 
 /**
  * Aliases a check to ensure that the given number is non-zero.
  *
  * @return The same number if it's non-zero, null otherwise.
  */
-fun Float.nonZeroOrNull() = if (this != 0f) this else null
+internal fun Float.nonZeroOrNull() = if (this != 0f) this else null
 
 /**
  * Aliases a check to ensure a given value is in a specified range.
@@ -56,7 +56,7 @@ fun Float.nonZeroOrNull() = if (this != 0f) this else null
  * @param range The valid range of values for this number.
  * @return The same number if it is in the range, null otherwise.
  */
-fun Int.inRangeOrNull(range: IntRange) = if (range.contains(this)) this else null
+internal fun Int.inRangeOrNull(range: IntRange) = if (range.contains(this)) this else null
 
 /**
  * Convert a [String] to a [UUID].
@@ -64,7 +64,7 @@ fun Int.inRangeOrNull(range: IntRange) = if (range.contains(this)) this else nul
  * @return A [UUID] converted from the [String] value, or null if the value was not valid.
  * @see UUID.fromString
  */
-fun String.toUuidOrNull(): UUID? =
+internal fun String.toUuidOrNull(): UUID? =
     try {
         UUID.fromString(this)
     } catch (e: IllegalArgumentException) {
@@ -76,7 +76,7 @@ fun String.toUuidOrNull(): UUID? =
  *
  * @param string The [String] to hash. If null, it will not be hashed.
  */
-fun MessageDigest.update(string: String?) {
+internal fun MessageDigest.update(string: String?) {
     if (string != null) {
         update(string.lowercase().toByteArray())
     } else {
@@ -89,7 +89,7 @@ fun MessageDigest.update(string: String?) {
  *
  * @param date The [Date] to hash. If null, nothing will be done.
  */
-fun MessageDigest.update(date: Date?) {
+internal fun MessageDigest.update(date: Date?) {
     if (date != null) {
         update(date.toString().toByteArray())
     } else {
@@ -102,7 +102,7 @@ fun MessageDigest.update(date: Date?) {
  *
  * @param strings The [String]s to hash. If a [String] is null, it will not be hashed.
  */
-fun MessageDigest.update(strings: List<String?>) {
+internal fun MessageDigest.update(strings: List<String?>) {
     strings.forEach(::update)
 }
 
@@ -111,7 +111,7 @@ fun MessageDigest.update(strings: List<String?>) {
  *
  * @param n The [Int] to write. If null, nothing will be done.
  */
-fun MessageDigest.update(n: Int?) {
+internal fun MessageDigest.update(n: Int?) {
     if (n != null) {
         update(byteArrayOf(n.toByte(), n.shr(8).toByte(), n.shr(16).toByte(), n.shr(24).toByte()))
     } else {
@@ -126,7 +126,7 @@ fun MessageDigest.update(n: Int?) {
  * @param clazz The [KClass] to reflect into.
  * @param method The name of the method to obtain.
  */
-fun lazyReflectedMethod(clazz: KClass<*>, method: String, vararg params: KClass<*>) = lazy {
+internal fun lazyReflectedMethod(clazz: KClass<*>, method: String, vararg params: KClass<*>) = lazy {
     clazz.java.getDeclaredMethod(method, *params.map { it.java }.toTypedArray()).also {
         it.isAccessible = true
     }
diff --git a/musikr/src/main/java/org/oxycblt/musikr/util/ParseUtil.kt b/musikr/src/main/java/org/oxycblt/musikr/util/ParseUtil.kt
index 3a474a0c7..4110c387b 100644
--- a/musikr/src/main/java/org/oxycblt/musikr/util/ParseUtil.kt
+++ b/musikr/src/main/java/org/oxycblt/musikr/util/ParseUtil.kt
@@ -7,7 +7,7 @@ package org.oxycblt.musikr.util
  * @param selector A block that determines if the string should be split at a given character.
  * @return One or more [String]s split by the selector.
  */
-inline fun String.splitEscaped(selector: (Char) -> Boolean): List<String> {
+internal inline fun String.splitEscaped(selector: (Char) -> Boolean): List<String> {
     val split = mutableListOf<String>()
     var currentString = ""
     var i = 0
@@ -53,11 +53,11 @@ inline fun String.splitEscaped(selector: (Char) -> Boolean): List<String> {
  * @return A string with trailing whitespace remove,d or null if the [String] was all whitespace or
  *   empty.
  */
-fun String.correctWhitespace() = trim().ifBlank { null }
+internal fun String.correctWhitespace() = trim().ifBlank { null }
 
 /**
  * Fix trailing whitespace or blank contents within a list of [String]s.
  *
  * @return A list of non-blank strings with trailing whitespace removed.
  */
-fun List<String>.correctWhitespace() = mapNotNull { it.correctWhitespace() }
+internal fun List<String>.correctWhitespace() = mapNotNull { it.correctWhitespace() }