Heavy metal vocalist Ronnie James Dio first gained major fame after replacing vocalist Ozzy Osbourne in what band?
Ozzy Osbourne Ozzy Osbourne John Michael "Ozzy" Osbourne (born 3 December 1948), also known as The Prince of Darkness, is an English vocalist, songwriter, actor and reality television star who rose to prominence during the 1970s as the lead vocalist of the heavy metal band Black Sabbath. He was kicked out of the band in 1979 due to alcohol and drug problems, but went on to have a successful solo career, releasing eleven studio albums, the first seven of which were all awarded multi-platinum certifications in the United States. Osbourne has since reunited with Black Sabbath on several occasions, recording the album
Chuck Billy (vocalist) Chuck Billy (vocalist) Charles "Chuck" Billy (born June 23, 1962) is an American vocalist, who is best known as the lead vocalist for the thrash metal band Testament. His influences include Rob Halford, Ronnie James Dio, Bruce Dickinson, Phil Mogg, James Hetfield, Ozzy Osbourne, Geddy Lee, Bon Scott, Steven Tyler, Alice Cooper, Robert Plant and Klaus Meine. Billy joined Legacy in 1986, replacing vocalist Steve "Zetro" Souza who would later join Exodus. After Legacy changed its name to Testament, the band released their debut album "The Legacy" in 1987, which featured one song written by Billy entitled "Do or Die".