Jack Black and a Band of Pre-Teens Perform Ozzy Osbourne Cover: Watch

Tom Morello shared a video of Jack Black performing a cover of Ozzy Osbourne's 'Mr. Crowley,' backed by a band of pre-teens.

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The Rock on Instagram: We didn't have this on the cards today Jack Black sung Ozzy Osbourne's 'Mr. Crowley' at Tom Morello's mum's 100th birthday, along with a School-Of-Rock-esque band of pre-teens

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Jack Black and a Band of Pre-Teens Perform Ozzy Osbourne Cover: Watch