what do you want it to have.
i learned just a couple of minutes ago the the X-box 360 version of guitar hero 2 has "The Trooper" by Iron Maiden, on it. upon reading that i began swearing and puching things. the trooper was a song i've been desperate to play on guitar hero, but at least their not ignoring iron maiden. hopefully there will be some maiden on GH 3. EDIT: after hearing the vocals on youtube, im sure bruce dickinson himself would agree that that sounds nothing like him.
also, something with Ronnie James Dio. hes a brilliant singer. he was in rainbows less famous early years. black sabbath in the 80's and his own band Dio. he was also in a band called elf but i know nothing about that and very few people do. Dio! Dio!