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

OnDestroy

public class MusicManager : MonoBehaviour
{
    ...
    void OnDestroy()
    {
        musicPlayEvent.setUserData(IntPtr.Zero);
        musicPlayEvent.stop(FMOD.Studio.STOP_MODE.IMMEDIATE);
        musicPlayEvent.release();
        timelineHandle.Free();
    }
}