interface Item {
		int getId();
		String getTitle();
		int getDuration();
	}

class MusicalElement implements Item {
	private int id, duration;
	private String title, content;
	public MusicalElement(int id, String title, int duration, String content) {
		this.id=id;
		this.title=title;
		this.duration=duration;
		this.content=content;
	}

	public int getId(){return id;}
	public String getTitle(){return title;}
	public int getDuration(){return duration;}



}