loadSound doesn't loop?

Can someone please tell me why this doesn’t work? I’m about to go crazy! It’s just supposed to be background music and it plays once then stops. WHY?

[AS]
backsound = new Sound();
backsound.loadSound(“sounds/loopy.mp3”, true);
backsound.onSoundComplete = backsound.start;
[/AS]

I have also tried backsound.start(0,999); but it doesn’t work either.
:h: