Black Sabbath are an English heavy metal band from Birmingham. The original band line up of Ozzy Osbourne (vocals), Tony Iommi (guitar), Terence "Geezer" Butler (bass), and Bill Ward (drums) is the same as the current line up (2007) although there have been many shifts of personnel over the years.Source
Black Sabbath remain a dominant influence in the heavy metal genre they helped create. VH1's 100 Greatest Artists of Hard Rock ranks them second, behind Led Zeppelin.
Currently, the early 1980s line-up of the band featuring Iommi, Butler, Ronnie James Dio and Vinny Appice are touring under the moniker Heaven and Hell, a title taken from the 1980 Black Sabbath album of the same name.
The original and best known line-up are frequently credited as the inventors of the heavy metal genre. Black Sabbath have sold over 100 million albums worldwide.