John Michael "Ozzy" Osbourne is an English singer, songwriter, and television personality. He rose to prominence during the 1970s as the lead vocalist of the heavy metal band Black Sabbath, during which period he adopted the nickname "Prince of Darkness". Osbourne was fired from the band in 1979 due to alcohol and drug problems, but went on to have a successful solo career, releasing 12 studio albums, the first seven of which received multi-platinum certifications in the US. Osbourne has since reunited with Black Sabbath on several occasions. He rejoined in 1997 and helped record the group's final studio album, 13, before they embarked on a farewell tour that ended with a February 2017 performance in their hometown, Birmingham, England. His longevity and success have earned him the informal title "Godfather of Metal".