code: protected synchronized void firePlaylistChangeEvent(PlaylistChangeEvent.Event event) {
          PlaylistChangeEvent pce = new PlaylistChangeEvent(this, event);
  
          for (PlaylistChangeListener pcl : listeners) {
              pcl.playlistChanged(pce);
          }
      }
docs: Sends the appropriate {@link PlaylistChangeEvent} to all registered
  {@link PlaylistChangeListener}.
  
  @param event the {@link PlaylistChangeEvent.Event} to send