Original Singer: Ozzy Osbourne
Reason for Departure: Ozzy was fired from the band in 1979 for heavy alcohol and cocaine use , which was excessive even by Black Sabbath standards.
The Replacements: Ronnie James Dio, Ian Gillan, David Donato, Glenn Hughes, Ray Gillen, Tony Martin
After Ozzy was canned, the band hired former Rainbow singer Ronnie James Dio (above right) at the suggestion of their manager’s daughter, Sharon Arden (later Sharon Osbourne). Dio split by 1982 to start his own band. A revolving door of vocalists followed, including Deep Purple's Ian Gillan. The members later reunited with both Osbourne and Dio (as Heaven & Hell). Dio died of stomach cancer in 2010. Rumors persist today of another reunion with Ozzy. —Jeff Royer
(Photos: Dave Hogan, Getty Images; Charley Gallay, Getty Images)
The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.