Vol 4

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By the time Black Sabbath began work on what was to be their fourth album in '72, the conveniently titled Volume 4, they were very much in the ascendant. Their fan base was growing with each succeeding tour and album, and their style was firmly established. However, to the band members, the treadmill of the rock cycle - album/tour/album/tour in perpetuity - offered no challenge any more. They wanted to stretch themselves, to push the parameters of what they'd already created. So, for the new album, the band took a leap of faith into the unknownalbum, unknown.