If you haven't heard of Alter Bridge, I would Highly, Highly recommend them. If their New Disc, Black Bird, becomes DLC, Rock Band would have some incredibly fun but difficult Guitar Parts (listen to the Song Blackbird, sheer genius). But their other stuff would be fun too, especially Open Your Eyes (I guarantee that you've heard this song before). Any way, if you've never heard of Alter Bridge, you should definately check them out.
Songs I'd Like To see:
Open Your Eyes
Anything from their Album Black Bird (specifically the title track)