Premise: Ozzy Osbourne . He rose to prominence in the early 1970s as the lead vocalist of the heavy metal band Black Sabbath . He was fired from Black Sabbath in 1979 and went on to have a successful solo career , releasing 11 studio albums , the first seven of which were all awarded multi-platinum certifications in the US . Osbourne has since reunited with Black Sabbath on several occasions , recording the album 13 in 2013 .
Hypothesis: Ozzy Osbourne was not a member of Black Sabbath.
Label: CONTRADICTION