Watch: GEEZER BUTLER Joins JACK BLACK's BLACK SABBATH Cover Band For 'War Pigs' At TOM MORELLO's 'Power To The People' Festival

BLACK SABBATH bassist Geezer Butler joined JACK SABBATH, the BLACK SABBATH tribute act fronted by Jack Black, on stage Saturday night (October 3) at Tom Morello's Power To The People festival at Columbia, Maryland's Merriweather Post Pavilion to perform the SABBATH classic "War…