Black Sabbath were an English rock band formed in Birmingham in 1968 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 (1970), Paranoid (1970), and Master of Reality (1971).
Inside the chaotic recording process of Black Sabbath's 'Vol. 4'
Black Sabbath never did anything by half measures, pushing almost everything in their lives to chaotic excess. Whether it was the volume levels of amps or their hedonistic approach to substances, Sabbath didn’t know when to stop,
Far Out Magazine
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Black Sabbath Ozzy Osbourne Tony Iommi Geezer Butler Official Black Sabbath Website
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