>. "Jethro Tull." Britania Biographies . 12 Nov 2006 < http://www.britannia.com/bios/jtull.html >. Black Sabbath(page 118) Black Sabbath is a heavy metal band which formed in Birmingham , England. The band consists of Ozzy Osbourne on vocals, Tony Iommi at guitar, Terence Butler at the bass, and Bill Ward on the drums.