Jack Black and Kids Cover Ozzy Osbourne for Tom Morello of Rage Against the Machine’s Mom’s 100th Birthday

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The actor joined Tom Morello’s son Roman and other pre-teen musicians for a performance of “Mr. Crowley”

Jack Black went full School of Rock for a sweet celebration.

The actor/singer, 54, attended a celebration for the 100th birthday of Rage Against the Machine guitarist Tom Morello’s mother, Mary Morello, and performed a cover at the event. Along with a band of 12 and 13-year-olds, including Morello’s son Roman Morello, the comedian covered Ozzy Osbourne’s 1980 classic “Mr. Crowley.”

The Rage Against the Machine musician, 59, shared footage of the performance from over the weekend on Tuesday.