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Jack Black recently got to re-live his School of Rock days, teaming up with a band of pre-teens to cover Ozzy Osbourne. It happened at an L.A. party celebrating the 100th birthday of Mary Morello, mother of Rage Against The Machine guitarist Tom Morello. Black and his young cohorts - including Morello's son Roman on guitar - covered the Ozzy classic "Mr. Crowley". Other famous rockers in the audience included Perry Farrell, Serj Tankian, and the rest of Rage Against The Machine. What rock star would you like to perform at your birthday party?