Ozzy and the gang are back in business. English rockers Black Sabbath returned to the stage to kick off Lollapalooza 2012 on Friday, their only reunion performance in the United States. "Fuckin' A man," said the 63-year-old Osbourne to a roaring crowd in Chicago's Grant Park. "Let me hear you!" The band played some old classics, and the black-leather-clad frontman referred to the song "Snowblind"—a song about cocaine—as one of the band's "favorite pastimes." Time, it seems, has not blunted Sabbath's edge.