Doesnt loop?

on (release) {
spSound.stop(“cool 2”);
spSound.stop(“world”);
spSound.stop(“cool 3”);
spSound.stop(“cool 1”);

spSound=new Sound();
spSound.loadSound(“world.mp3”,true);
spSound.attachSound(“world.mp3”);
spSound.start(0, 99);

trace(bytesLoaded)
}does any one know why this doesnt loop???