Few bands have realigned their whole modus operandi around a single song. But for Black Sabbath, the title track from their self-titled 1970 debut album represented a stylistic shift that changed the group irrevocably and would be the single most important step in formulating what would become known as heavy metal. The four members of the group had grown up in the Aston area of Birmingham and all had come from humble backgrounds. Vocalist John 'Ozzy' Osbourne had done a string of manual and factory jobs, including working in an abbatoir, and had also spent six weeks in prison.
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