AudioSource in Update

Hey guys,

I have different background music clips that should play even if I restart the game.

For that purpose I have created a Script attached on a gameObject that only plays the music.

 private var player : GameObject;
 var mg : AudioClip;
 var def : AudioClip;
 
 function Awake(){
     DontDestroyOnLoad(this.gameObject);
     if (FindObjectsOfType(GetType()).Length > 1){
         Destroy(gameObject); //Avoid duplicate on scene restart
     }
 }
 
 function Start () {
     player = GameObject.Find("Player");
 }
 
 function Update () {
     if(PlayerPrefs.GetInt("TimesPlayed") >= PlayerPrefs.GetInt("OverallScore")){
         GetComponent.<AudioSource>().clip = mg;
         GetComponent.<AudioSource>().Play();
     }
     if(player.transform.GetChild(0).gameObject.name == "CubeDefault"){
         GetComponent.<AudioSource>().clip = def;
         GetComponent.<AudioSource>().Play();
     }
 }

The problem is that the specified clip is called every frame since it is in the update function, but it needs to be in this function, because

• at Runtime the music can change,

• the script will never be destroyed and so I can not put this code to the start/awake function as they read the content only once.

The solution would be some kind of "if" that change their values to call

GetComponent.<AudioSource>().Play();
only once, but how can I do this?

Thanks