In the past 25 years, Dave Grohl has played in a few little-known bands like Nirvana and the Foo Fighters, directed a documentary about Los Angeles' famed Sound City Studios and created a TV series for HBO. But that was evidently never enough for the hyper-energetic multi-instrumentalist, who has also done duty with dozens of artists, drumming for Tom Petty, helping Puff Daddy remix his biggest hit and playing the devil for Tenacious D. With our new Grohl cover story hitting stands this week, here are 15 of our favorite Grohl cameos.