var NewMusic: AudioClip; //Pick an audio track to play.
function Awake () {
var go = GameObject.Find("Game Music"); //Finds the game object called Game Music.
if (go.audio.clip != NewMusic) {
go.audio.clip = NewMusic; //Replaces the old audio with the new one set in the inspector.
go.audio.Play(); //Plays the audio.
    }
}