Black Sabbath
In August 1969, after being confused with another group named Earth (who had minor success in England), the group renamed themselves Black Sabbath after a horror film. His factory accident affected the Black Sabbath sound; Iommi had tuned down his guitar by 1971's Master of Reality album, lowering string tension and easing the pain to his fingertips. Black Sabbath bassist Geezer Butler did the same to match Iommi. Sabbath was among the first bands to utilize lower tunings, and the technique became a mainstay of heavy metal music. Iommi combined blues-like guitar solos and dark, minor-key riffing with a revolutionary high-gain, heavily distorted tone with his use of power chords, a modified treble-boosting effect-pedal and a Gibson SG.
By the late 1970s, Black Sabbath were experiencing problematic substance use, managerial problems, and touring exhaustion. In addition, the band's slow, blues-driven riffs were seen by some as outmoded against the rising generation of metal bands such as Judas Priest and Motörhead. After the albums Technical Ecstasy and Never Say Die! were not universally critically well received, Iommi and Butler decided that Sabbath needed a fresh start so, in the summer of 1979, they replaced Osbourne with Ronnie James Dio, the former vocalist for Rainbow. With Dio, Black Sabbath produced Heaven and Hell, an album that attempted to update Black Sabbath's sound for the 1980s and include the soaring vocals that characterised the NWOBHM (New wave of British heavy metal) scene. Halfway through the 1980 tour, Bill Ward dropped out due to alcohol problems and displeasure with the direction that Dio was taking the band. He was replaced by Vinny Appice. With Iommi and Geezer Butler the only original members, this line-up produced Mob Rules. Dio quit the following year to begin a solo career, so Sabbath went through a revolving door line-up for the next decade with a succession of frontmen: Ian Gillan, Glenn Hughes, Ray Gillen, and Tony Martin. After Ian Gillan (formerly of Deep Purple) departed the band in 1984, Geezer Butler left as well. With Sabbath in effective hiatus, Iommi recorded his first solo album, titled Seventh Star. The album featured Glenn Hughes (also formerly of Deep Purple) on vocals, but due to label pressures, it was billed as a release by "Black Sabbath featuring Tony Iommi".
In 1992, Iommi appeared at The Freddie Mercury Tribute Concert, playing four songs with the remaining members of Queen and other guest artists. Geezer Butler also returned to Sabbath that year. In the following year Iommi teamed up with fellow Black Country band Diamond Head and co-wrote the song "Starcrossed (Lovers in the Night)" for their 1993 Death and Progress album. At Osbourne's "farewell" concert at Costa Mesa in 1992, Dio refused to perform and abruptly left the band. As a result, Rob Halford was recruited to perform as the vocalist for two gigs (Halford also sang at one of the dates on the 2004 Ozzfest tour, when Osbourne could not perform due to bronchitis). Following Osbourne's solo set, the show concluded with the other members of the original Black Sabbath line-up joining for a 4-song reunion.
Black Sabbath went on to record two further albums with Tony Martin before the original line-up reunited as a touring band in 1997. While Bill Ward played at the two initial reunion shows at Birmingham NEC in December 1997, he was not present for the following two reunion tours, his second absence due to a heart attack. Ward was replaced by Mike Bordin and then Vinny Appice.
On 11 November 2011, Black Sabbath announced that they would be reuniting with the original line-up and would be recording a new album. Bill Ward did not participate and was eventually replaced by Rage Against the Machine drummer Brad Wilk for drum sessions. The new album, 13, was released in June 2013. They disbanded at the conclusion of The End Tour in early 2017.
In October 2006 it was reported that Iommi would tour with Ronnie James Dio, Geezer Butler, and Bill Ward again, but under the name Heaven & Hell. Later it was announced that Ward had decided not to participate, and Vinny Appice was hired as his replacement. Rhino Records released The Dio Years (under the 'Black Sabbath' moniker) album on 3 April 2007. The album showcased older tracks with Dio and also included three brand new songs recorded with Dio and Appice.
The band started an American tour in April 2007 with Megadeth and Down as opening acts. The tour finished in November in England with the prospect of an album to follow in 2008. During this period the band's show at the New York Radio City Music Hall was released as both a live DVD and CD with a vinyl release in the UK in 2008. During the summer of 2008 the band embarked on the Metal Masters Tour along with Judas Priest, Motörhead, and Testament. The band's first and only studio album, The Devil You Know, was released on 28 April 2009.
Dio died of stomach cancer in May 2010, and on 14 June 2010, Iommi announced that Heaven & Hell would perform a one-off tribute to Ronnie James Dio at the High Voltage Festival, London on 24 July 2010. This was the band's last performance under the name.