Black Sabbath is a British band incalculably influential for heavy music. Originaly comprising Ozzy Osbourne (vocals), Tony Iommi (guitar), Geezer Butler (bass), and Bill Ward (drums), in the early '70s they were the first to pair heavily distorted, sonically dissonant blues-rock at crushingly slow speeds with lyrics about mental pain and abominations of war (they came from Aston - a poor district of Birmingham damaged by bombing during World War 2), thus giving birth to generations upon generations of metal bands that followed in their wake.

Black Sabbath formed in Birmingham, England in 1968 under the name Polka Tulk Blues Band (soon shortened to "Polka Tulk"), and later Earth. Initially a blues-rock band, Earth moved in a darker direction when their bassist, Geezer Butler, a fan of the black magic novels of Dennis Wheatley, wrote lyrics for an occult-themed song titled "Black Sabbath" (the song name was inspired by a 1963 Mario Bava film), and Tony Iommi wrote a riff based on the "diablos in musica", i.e. the Devil in Music. This interval, diablos in musica, had been banned centuries ago due to its dark and dissonant sound, and rarely - if ever - featured in popular music culture. In their Last Supper concert film, the band stated that the song is based on an experience Geezer had one night when he saw a black object at the end of his bed and noticed the next day that an occult book Ozzy had given him was missing. When the band found themselves being confused with another local band called Earth, they adopted the song title as their new name.

As the band evolved, they added more European folk elements and gothic flourishes to their sound, that was not like any other group during their time. Their lyrics dealt with darker issues than most conventional rock. Towards the late '60s, bands were into the peace movement and the dying hippie culture, whilst Sabbath chose to distinguish themselves by dealing with heavier issues; the occult, war, apocalypse, anti-drug messages, and gothic storytelling. Their music also conveyed a sense of anger and anti-establishment, the likes of which had never been heard before.

It was this mix of dark lyrical themes and a slower, ominous sound that made Black Sabbath a significant element in the genre that would later be known as heavy metal.

The group found its signature sound almost by accident. When the group was rehearsing in a studio which was situated opposite a cinema showing a horror movie, Osbourne recalls that Tony Iommi said to the rest of the band, "If people pay to see scary movies, why wouldn't they pay to listen to scary music?" The band began to purposely write dark, ominous riffs in an attempt to be music's answer to horror movies.

Despite their doom-laden image, much of the group's early material featured acoustic guitar, piano, symphony orchestras, keyboards, and even horns. After the band's first four albums, the group became increasingly psychedelic, experimental and progressive, leaving much of their dark metal roots behind. The last two Osbourne-fronted albums, Technical Ecstasy (1976) and Never Say Die! (1978) left a lot of fans dissatisfied with the band, as drugs and alcohol abuse began to take its toll on each member.

Osbourne was fired in 1978 for becoming increasingly unstable and unwilling to work with the material that, by this time, Tony Iommi was writing more or less entirely himself. Osbourne started a highly successful solo career in 1980.

In 1979 Tony Iommi recruited former Rainbow members singer Ronnie James Dio and bassist Craig Gruber. Gruber was recruited because Geezer Butler was rumoured to be leaving the band, but this never eventuated and Gruber was dismissed. Black Sabbath's first album with Dio, Heaven and Hell, proved to be a success, and saw the band's highest American charting since 1975's Sabotage. It was on this tour that Dio popularised the "devil horns" hand gesture, which has since become a symbol of heavy metal music in general. The album also marked the inclusion of Quartz's guitarist-turned-keyboardist Geoff Nicholls (Nicholls has not been consistently credited as an official member, and has often been forced to play live shows from backstage for supposed aesthetic purposes, but he has co-written many songs and has stayed with Black Sabbath through all subsequent incarnations). Also during the tour, drummer Bill Ward quit the band for personal reasons (both his parents died within a rather short period, and Ward was struggling with alcoholism and other addictions). Drummer Vinny Appice joined to complete the tour and then record the next album Mob Rules, in which an early version of the title track appeared in the movie Heavy Metal.

Ronnie James Dio and drummer Vinny Appice left the band after supposed disputes over the mixing of the live album Live Evil, and persued a solo career together. Black Sabbath re-enlisted drummer Bill Ward, and, along with ex-Deep Purple singer Ian Gillan (who agreed to join the band whilst heavily intoxicated), released Born Again in 1983. It reached a respectable #2 in the UK music charts, a success not seen since Sabbath Bloody Sabbath, ten years previously. However, the album was not received particularly fondly by critics or fans alike, and not even by singer Ian Gillan. The tour that followed was to provide a wealth of material for the spoof documentary on rock 'n' roll culture, Spinal Tap. Drummer Bill Ward was still recovering from poor health and so did not tour for the Born Again album. Instead, fellow Brummie Bev Bevan, formerly of The Move and the Electric Light Orchestra, took to the drumstool for the tour obligations.

Once the tour was over, Ian Gillan left the band to rejoin his Mk.2 Deep Purple band mates. From here on the line-ups of Black Sabbath changed unrelentlessly, with Tony Iommi being the only constant member. Between 1986 and 1995 Black Sabbath released 7 studio albums and one live album, including a reunion album with the Mob Rules line-up (1992's Dehumanizer). In 1997 the original line-up reunited for a proper world tour (as opposed to the one-off Live Aid in 1985, and Costa Mesa gigs on Ozzy's "Farewell" tour in 1992) and have toured on and off since.

Currently the Mob Rules line-up have reunited once more under the banner "Heaven & Hell" and are touring the world in 2007, promoting Black Sabbath - The Best of: the Dio Years featuring three new tracks and a release of Black Sabbath Live at the Hammersmith Odeon, 1982.

VH1's '100 Greatest Artists of Hard Rock' ranked them second, behind Led Zeppelin. They were inducted into the Rock 'n' Roll Hall of Fame and the UK Music Hall of Fame in 2006.

Black Sabbath Discography:
Black Sabbath (1970)
Paranoid (1970)
Master of Reality (1971)
Vol. 4 (1972)
Sabbath Bloody Sabbath (1973)
Sabotage (1975)
Technical Ecstasy (1976)
Never Say Die! (1978)
Live at Last (1980)
Heaven & Hell (1980)
Mob Rules (1982)
Live Evil (1983)
Born Again (1983)
Seventh Star (1986)
The Eternal Idol (1987)
Headless Cross (1989)
Tyr (1990)
Dehumanizer (1992)
Cross Purposes (1994)
Cross Purposes Live (1994)
Forbidden (1995)
Reunion (1997)
Live at Hammersmith Odeon (2007)

Alphabetical Personnel:
Don Airey - keyboards
Vinny Appice - drums
Bev Bevan - drums
Mike Bordin - drums
Jo Burt - bass
Geezer Butler - bass
Terry Chimes - drums
Gordon Copely - bass
Laurence Cottle - bass
Bob Daisley - bass
Ronnie James Dio - vocals
Dave Donato - vocals
Ian Gillan - vocals
Ray Gillen - vocals
Rob Halford - vocals
Glenn Hughes - vocals
Tony Iommi - guitar
Ron Keel - vocals
Tony Martin - vocals
Neil Murray - bass
Geoff Nicholls - keyboards
Ozzy Osbourne - vocals
Cozy Powell - drums
Bobby Rondinelli - drums
Eric Singer - drums
Dave Spitz - bass
Adam Wakeman - keyboards
Rick Wakeman - keyboards
Dave Walker - vocals
Bill Ward - drums
Jezz Woodruffe - keyboards