song.addArtist(new Artist("Michael", "Jackson"));
playlist.addSong(song);
song = new Song("Adagio", Song.Genre.CLASSICAL, 2561, 1708);
song.addArtist(new Artist("Johann Sebastian", "Bach"));
playlist.addSong(song);
song = new Song("The final countdown", Song.Genre.ROCK, 300, 1985);
song.addArtist(new Artist("Joey", "Tempest"));
song.addArtist(new Artist("John", "Norum"));
playlist.addSong(song);