Audio Score Trigger Help

Basically, I have four different game music clips that I want the game to cycle through, changing when you hit every 10,000 or so points. For some reason, the code I am working with will not get the music to play. The visible score variable is taken care of elsewhere in the script and is not important right now, it just goes up as you move farther in the game.

var cycle: int = 0;

var gameMusic1;

var gameMusic2;

var gameMusic3;

var gameMusic4;

var visibleScore;

var hiddenScore = 0;

var gameMusic = [gameMusic1, gameMusic2, gameMusic3, gameMusic4];

function Update () {

 if (visibleScore >= hiddenScore + 10000 || visibleScore == 0)
 {
     audio.PlayOneShot(gameMusic[cycle]);
     hiddenScore = visibleScore;
     cycle++;

     if (cycle == 4)

     {
         cycle = 0;
     }
 }

I don't know if my methodology is correct, so any suggestions would be great.