var song = {
  name: "Perfect day",
  artist: "Lou Reed",
  genre: "Rock",
  length: "3:44",
  start: function() {
    alert("And now, " + this.artist + " singing " + this.name);
  },
  stop: function() {
    alert("Hope you enjoyed " + this.name + " singed by " + this.artist);
  }
};

song.start();
song.stop();