While this can’t really compare to the  Tori vs. Gaga feud, we were surprised last week when M.I.A. unleashed her wrath via Twitter about Tenacious D replacing the Beastie Boys on the 2009 Outside Lands Festival lineup. (“Can’t believe they replaced Beasties with Tenacious D? And if I pull out they sue! So really? Tenacious D after me?”) We’re glad to hear Jack Black isn’t letting it get him down, and by all accounts, their performance was a big success. Satan even showed up on stage; check out an image after the jump. [via MTV]