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...