Input (grade 12): Black Sabbath were an English rock band, formed in Aston, Birmingham in 1969 by Ozzy Osbourne (lead vocals), Tony Iommi (guitar), Geezer Butler (bass guitar), and Bill Ward (drums).
Output (grade 6): The original line up was Ozzy Osbourne (vocals), Tony Iommi (guitar), Terence "Geezer" Butler (bass) and Bill Ward (drums). Black Sabbath formed in 1968.