public class Music {
  	private MusicPattern pattern;
  	private MusicPath path;
  	private long startDelai; // in ms
  	private long length; // in ms
  
  	public Music(MusicPattern pattern, MusicPath path, long startDelai, long length) {
  		this.pattern = pattern;
  		this.path = path;
  		this.startDelai = startDelai;
  		this.length = length;
  		
  		//call MusicPath transform()
  	}
  }