This video demonstrates the two ways in which a Flash programmer can define a sound file through Actionscript 3.0 for full on script control. // First method of defining a sound file to play var snd:Sound = new Sound(); var req:URLRequest = new URLRequest("mp3_files/thriller.mp3"); snd.load(req); snd.play(); // Second method of defining a sound file to play var snd:myTrack = new myTrack(); snd.play(); // Watch the video to discover the differences in them