Reference Manual - 1.1.1
IFusionSoundMusicProvider   EnumTracks

Enumerate all tracks contained in the file.

EnumTracks (
  IFusionSoundMusicProvider   * thiz,
  FSTrackCallback   callback,
  void   * callbackdata
);

Calls the given callback for all available tracks.
The callback is passed the track id that can be used to select a track for playback using IFusionSoundMusicProvider::SelectTrack().