Freaky Menu uses metadata.json for BPM data.

source/funkin/TitleState.hx

@@ -135,12 +135,7 @@ class TitleState extends MusicBeatState
 
   function startIntro()
   {
-    if (FlxG.sound.music == null || !FlxG.sound.music.playing)
+    playMenuMusic();
-    {
-      FlxG.sound.playMusic(Paths.music('freakyMenu'), 0);
-      FlxG.sound.music.fadeIn(4, 0, 0.7);
-      Conductor.forceBPM(Constants.FREAKY_MENU_BPM);
-    }
 
     persistentUpdate = true;
 
@@ -234,6 +229,18 @@ class TitleState extends MusicBeatState
     if (FlxG.sound.music != null) FlxG.sound.music.onComplete = function() FlxG.switchState(new VideoState());
   }
 
+  function playMenuMusic():Void
+  {
+    if (FlxG.sound.music == null || !FlxG.sound.music.playing)
+    {
+      var freakyMenuMetadata:SongMetadata = SongData.parseMusicMetadata('freakyMenu');
+      Conductor.mapTimeChanges(freakyMenuMetadata.timeChanges);
+
+      FlxG.sound.playMusic(Paths.music('freakyMenu/freakyMenu'), 0);
+      FlxG.sound.music.fadeIn(4, 0, 0.7);
+    }
+  }
+
   function getIntroTextShit():Array<Array<String>>
   {
     var fullText:String = Assets.getText(Paths.txt('introText'));

source/funkin/play/PlayState.hx

@@ -887,7 +887,7 @@ class PlayState extends MusicBeatState
       trace('Song difficulty could not be loaded.');
     }
 
-    Conductor.forceBPM(currentChart.getStartingBPM());
+    // Conductor.forceBPM(currentChart.getStartingBPM());
 
     vocals = currentChart.buildVocals(currentPlayerId);
     if (vocals.members.length == 0)

source/funkin/play/song/SongData.hx

@@ -20,6 +20,7 @@ class SongDataParser
 
   static final DEFAULT_SONG_ID:String = 'UNKNOWN';
   static final SONG_DATA_PATH:String = 'songs/';
+  static final MUSIC_DATA_PATH:String = 'music/';
   static final SONG_DATA_SUFFIX:String = '-metadata.json';
 
   /**
@@ -176,6 +177,36 @@ class SongDataParser
     return rawJson;
   }
 
+  public static function parseMusicMetadata(musicId:String):SongMetadata
+  {
+    var rawJson:String = loadMusicMetadataFile(musicId);
+    var jsonData:Dynamic = null;
+    try
+    {
+      jsonData = Json.parse(rawJson);
+    }
+    catch (e) {}
+
+    var musicMetadata:SongMetadata = SongMigrator.migrateSongMetadata(jsonData, musicId);
+    musicMetadata = SongValidator.validateSongMetadata(musicMetadata, musicId);
+
+    return musicMetadata;
+  }
+
+  static function loadMusicMetadataFile(musicPath:String, variation:String = ''):String
+  {
+    var musicMetadataFilePath:String = (variation != '') ? Paths.json('$MUSIC_DATA_PATH$musicPath/$musicPath-metadata-$variation') : Paths.json('$MUSIC_DATA_PATH$musicPath/$musicPath-metadata');
+
+    var rawJson:String = Assets.getText(musicMetadataFilePath).trim();
+
+    while (!rawJson.endsWith("}"))
+    {
+      rawJson = rawJson.substr(0, rawJson.length - 1);
+    }
+
+    return rawJson;
+  }
+
   public static function parseSongChartData(songId:String, variation:String = ""):SongChartData
   {
     var rawJson:String = loadSongChartDataFile(songId, variation);
@@ -365,7 +396,7 @@ abstract SongNoteData(RawSongNoteData)
   public function get_stepTime():Float
   {
     // TODO: Account for changes in BPM.
-    return this.t / Conductor.stepLengthMs;
+    return this.t / Conductor.stepCrochet;
   }
 
   /**
@@ -551,7 +582,7 @@ abstract SongEventData(RawSongEventData)
   public function get_stepTime():Float
   {
     // TODO: Account for changes in BPM.
-    return this.t / Conductor.stepLengthMs;
+    return this.t / Conductor.stepCrochet;
   }
 
   public var event(get, set):String;
@@ -764,7 +795,7 @@ typedef RawSongTimeChange =
    * Time in beats (int). The game will calculate further beat values based on this one,
    * so it can do it in a simple linear fashion.
    */
-  var b:Int;
+  var b:Null<Float>;
 
   /**
    * Quarter notes per minute (float). Cannot be empty in the first element of the list,
@@ -794,9 +825,9 @@ typedef RawSongTimeChange =
  * Add aliases to the minimalized property names of the typedef,
  * to improve readability.
  */
-abstract SongTimeChange(RawSongTimeChange)
+abstract SongTimeChange(RawSongTimeChange) from RawSongTimeChange
 {
-  public function new(timeStamp:Float, beatTime:Int, bpm:Float, timeSignatureNum:Int = 4, timeSignatureDen:Int = 4, beatTuplets:Array<Int>)
+  public function new(timeStamp:Float, beatTime:Null<Float>, bpm:Float, timeSignatureNum:Int = 4, timeSignatureDen:Int = 4, beatTuplets:Array<Int>)
   {
     this =
       {
@@ -821,14 +852,14 @@ abstract SongTimeChange(RawSongTimeChange)
     return this.t = value;
   }
 
-  public var beatTime(get, set):Int;
+  public var beatTime(get, set):Null<Float>;
 
-  public function get_beatTime():Int
+  public function get_beatTime():Null<Float>
   {
     return this.b;
   }
 
-  public function set_beatTime(value:Int):Int
+  public function set_beatTime(value:Null<Float>):Null<Float>
   {
     return this.b = value;
   }

source/funkin/ui/story/StoryMenuState.hx

@@ -115,12 +115,7 @@ class StoryMenuState extends MusicBeatState
     transIn = FlxTransitionableState.defaultTransIn;
     transOut = FlxTransitionableState.defaultTransOut;
 
-    if (!FlxG.sound.music.playing)
+    playMenuMusic();
-    {
-      FlxG.sound.playMusic(Paths.music('freakyMenu'));
-      FlxG.sound.music.fadeIn(4, 0, 0.7);
-    }
-    Conductor.forceBPM(Constants.FREAKY_MENU_BPM);
 
     if (stickerSubState != null)
     {
@@ -129,8 +124,6 @@ class StoryMenuState extends MusicBeatState
 
       openSubState(stickerSubState);
       stickerSubState.degenStickers();
-
-      // resetSubState();
     }
 
     persistentUpdate = persistentDraw = true;
@@ -203,6 +196,18 @@ class StoryMenuState extends MusicBeatState
     #end
   }
 
+  function playMenuMusic():Void
+  {
+    if (FlxG.sound.music == null || !FlxG.sound.music.playing)
+    {
+      var freakyMenuMetadata:SongMetadata = SongData.parseMusicMetadata('freakyMenu');
+      Conductor.mapTimeChanges(freakyMenuMetadata.timeChanges);
+
+      FlxG.sound.playMusic(Paths.music('freakyMenu/freakyMenu'), 0);
+      FlxG.sound.music.fadeIn(4, 0, 0.7);
+    }
+  }
+
   function updateData():Void
   {
     currentLevel = LevelRegistry.instance.fetchEntry(currentLevelId);