Timmy and the Lords of the Underworld is the highlight of Rock Band's 13 unlockable bonus tracks. As those who have been following Harmonix's next music game, Rock Band includes 45 licensed tracks ...

Notable inclusions come from Timmy & The Lords of the Underworld, the fake band of South Park's handicapable resident Timmy, as well as "Brainpower" from electroclash rockers Freezepop.