code: public static void poll(int delta) {
  		if (currentMusic != null) {
  			SoundStore.get().poll(delta);
  			if (!SoundStore.get().isMusicPlaying()) {
  				if (!currentMusic.positioning) {
  					Music oldMusic = currentMusic;
  					currentMusic = null;
  					oldMusic.fireMusicEnded();
  				}
  			} else {
  				currentMusic.update(delta);
  			}
  		}
  	}
docs: Poll the state of the current music. This causes streaming music
  to stream and checks listeners. Note that if you're using a game container
  this will be auto-magically called for you.
  
  @param delta The amount of time since last poll