Kid Cudi packed the stage with lots of friends for "Maniac." St. Vincent did her sample -- from Actor's "The Strangers" live, while Cage sang/rapped and the Roots backed them. The best instrument on stage, besides St. Vincent's pipes (and Cage's leather jacket), was the iPhone used for extra percussion. Watch:
Man on the Moon II: The Legend of Mr. Rager is out 11/9 via GOOD Music/Universal Motown.
