By Steve Newton Since time immemorial--or at least since Dio replaced Ozzy in Sabbath back in '79--armchair rock critics have debated the merits of the two singers. It's hard to complain about anything Ozzy did with the band up until the awesome Sabbath, Bloody Sabbath album of 1973; then again, after three spotty LPs, Dio … Continue reading That time I asked Tony Iommi how Ronnie James Dio compared to Ozzy Osbourne in Black Sabbath