public override void PlayIsStartedEvent(object sender, PlayStartedEventArgs e)
 {
     Console.WriteLine($"Violinist {Name} plays composion #{e.Sound}: La-la!");
 }
 public override void PlayIsStartedEvent(object sender, PlayStartedEventArgs e)
 {
     Console.WriteLine($"Hornist {Name} starts playing composion #{e.Sound}: Du-du!");
 }
 public abstract void PlayIsStartedEvent(object sender, PlayStartedEventArgs e);