Actor and comedian Tony Cavalero — who played Dewey Finn on the 2016 Nickelodeon TV series School of Rock — appears as Ozzy Osbourne, a vocalist, songwriter, and reality TV star who is best known as the lead vocalist of the heavy metal band Black Sabbath. Osbourne was the one who first discovered Mötley Crüe, and he helped the band gain attention when they opened for him on his 1984 world tour.