 Heaven & Hell played one final show, with Glenn Hughes and Jørn Lande as guest vocalists.Black Sabbath formed in 1968, taking members from two other local bands – guitarist Tony Iommi and drummer Bill Ward from Mythology, and vocalist Ozzy Osbourne and bassist Geezer Butler from Rare Breed.Initially known as The Polka Tulk Blues Band, the group's name was changed in September 1968 to Earth, before they became Black Sabbath in August 1969 after being confused with another British act of the same name.