Jack Black Honors Ozzy Osbourne with Epic ‘Mr. Crowley’ Cover at Black Sabbath’s Final Concert ...

Jack Black rocked his 'Mr. Crowley' cover for Ozzy Osbourne's farewell, but he had the help of the talented sons of two music ...

Jack Black teamed with the sons of Tom Morello and Scott Ian to cover Ozzy Osbourne's "Mr. Crowley" in a pre-taped video ...