public MP3Container lookFor(MP3Filter filter) {
		Vector<MP3> searchList = new Vector<MP3>();
		Vector<Integer> resList = new Vector<Integer>();
		
		for (int i = 0; i < size();i++) { 
			  MP3 s = list.get(i); 
			  if (filter.fit(s)) {
	             searchList.add(s);
	             resList.add(i);
			  }
	    }
		
		return new MP3Container(searchList,resList);
	}