Need some help with Layers and Actionscript

Ok in my first layer I have a an mp3 playing when you enter, then when you click on some buttons which are inside of a movie clip it loads another movie clip inside of it. My problem here is that when that movie clip ends I want my sound to start back up. can someone please help me.

I tried _root., _parent, and it doesnt seem to work for me at all. :S Im really stuck on this one.