Aerosmith is not on GH3. I am quite happy that Black Sabbath - Paranoid may be on and possibly Through Fire and Flames by Dragonforce.
I don't think they've announced all the songs yet. IGN only has like 10-12 songs listed since I last checked. If Aerosmith isn't on it, I'm dissapointed cuz they are really good and my favorite band. :(