Black Sabbath

Black Sabbath were an English rock band formed in Birmingham in the 70s by guitarist Tony Iommi, drummer Bill Ward, bassist Geezer Butler and vocalist Ozzy Osbourne. They are often cited as pioneers of heavy metal music. The band helped define the genre with releases such as Black Sabbath, Paranoid and Master of Reality. Black Sabbath had multiple line-up changes following Osbourne's departure in 1979, with Iommi being the only constant member throughout its history.

Besides that they inspired a whole new sub-genre to Heavy Metal named DOOM. A genre defined by slow, distorted dreamy & dreary riffs thought up by Iommi.