Black Sabbath fan Jason Momoa moshes out during Ozzy Osbourne's star-studded farewell show as Dolly Parton, Jack Black and Sir Elton John lead the surprise celebrity tributes to legendary rocker at Villa Park

WithΒ 42,000 fans packed into Birmingham 's Villa Park, heavy metal pioneers Black Sabbath returned to the stage for Ozzy Osbourne 's farewell show - the band's first live performance since 2005.

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