Yes, Ronnie James Dio really did sing War Pigs years before he joined Black Sabbath
In late 1982, Black Sabbath launch their Live Evil album. Released in part due to Tony Iommi's frustration with Ozzy Osbourne's Speak of the Devil – a live album consisting entirely of Sabbath songs that beat it to the stores by a couple of weeks – it features recordings taken from the band's Mob Rules tour.Side two, track two: it's the classic War Pigs, with Iommi's iconic two-chord riff backed by a rhythm section that swings in a way most rhythm sections simply don't. Out front, Ronnie James Dio tackles Ozzy&apos...
Source: loudersound.com