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Tom Morello's 'Power to the People' festival at Maryland's Merriweather Post Pavilion brought together stars including Bruce Springsteen, Dave Matthews, Foo Fighters, Jack Black's Black Sabbath cover band with Geezer Butler, and Dave Grohl for a night billed as 'a celebration of peace, love, justice, music and community action.' Highlights included Springsteen covering Neil Young's 'Rockin' in the Free World' with Grohl and Dave Matthews, and Jack Black's tribute act performing 'War Pigs' with Butler.