Black Sabbath are an English rock band, formed in Birmingham in 1968 by Ozzy Osbourne (lead vocals), Tony Iommi (guitar), Geezer Butler (bass), and Bill Ward (drums and percussion). The band has since experienced multiple lineup changes, with a total of twenty-two former members. Originally formed as a heavy blues-rock band named Earth, the band began incorporating occult- and horror-inspired lyrics with tuned-down guitars, changing their name to Black Sabbath and releasing multiple gold and platinum records in the 1970s. As one of the first and most influential heavy metal bands of all time, Black Sabbath helped define the genre with releases such as 1970s quadruple-platinum Paranoid. They were ranked by MTV as the "Greatest Metal Band" of all time, and have sold over fifteen million records in the United States alone.