Thirty years ago, Ozzy Osbourne unceremoniously left Black Sabbath and was replaced by an upstart named Ronnie James Dio. Less than a year later, in 1980, Sabbath seemingly revived their career with “Heaven & Hell,” an album that promised a similar but different take on what fans had come to think of as Black Sabbath. Armed with Dio’s operatic, powerful voice, Tony Iommi refined his guitar playing, and for a time, Black Sabbath was back.
