When the soundtrack for Halo 3 is released, it's going to have a track that you won't remember from any levels of the game. No, this track will be the product of one lucky contest winner who'll be picked by Halo composer Marty O'Donnell, Steve Vai and "hit artists including The Used and Red Jumpsuit Apparatus," for reasons no one can't begin to fathom.
The odd part is that your band's song doesn't even have to have anything to do with Halo 3. It just has to be a song. Any song. At all.