public void AddObserver(ISongObserver songObserver) { songObservers.Add(songObserver); }
public void RemoveObserver(ISongObserver observer) { songObservers.Remove(observer); }
public void AddObserver(ISongObserver songObserver) { songObservers.Add(songObserver); }
public void RemoveObserver(ISongObserver observer) { songObservers.Remove(observer); }