Sound on mc

I read the tut for adding sound to a button, but I want to add it to a movie clip. I already added some action to the clip, so I actually need to know where it would go too. I tried some stuff that didn’t work, so I figured I’d ask the geniuses. I need an mp3 to play on rollover and on down (I don’t know what it’s called for a movie clip. I even created a small button inside the MC to try to add sound to it, but that still didn’t work.

Thanks all