BeatmapDescriptionCallbacks from MusicManager.cs script from Colin Vandervort article "FMOD Unity: Beat-Mapping"

BeatmapDescriptionCallbacks

public class MusicManager : MonoBehaviour
{
    ...
    private void Start()
    {
        ...
        musicPlayEvent.getDescription(out descriptionCallback);
        descriptionCallback.getLength(out int length);

        timelineInfo.songLength = length;
    }
	
    private void Update()
    {
        mainMusicPlayEvent.getTimelinePosition(out timelineInfo.currentPosition);
    }
}