Original: 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).
Simplified: The original line up was Ozzy Osbourne (vocals), Tony Iommi (guitar), Terence "Geezer" Butler (bass) and Bill Ward (drums). Black Sabbath formed in 1968.