Overlooked by fans and the band alike, this album, coupled with Sabotage, marks Sabbath's finest hour. As accomplished, coherent, brilliantly produced, orchestrated, sung and played as anything put out that decade, Sabbath skimmed the surface of the prog rock movement without getting bogged down in pretension. Makes previous Sabbath albums seem workmanlike. Sister album Sabotage a bit more hit and miss, but should be played together with this - The Writ, Spiral Architect, A National Acrobat, Looking for Today, Hole in the Sky and Thrill of it All widdle on the likes of Iron Man, Faries Wear Boots and NIB from a very great height. Following up such genius proved impossible, and both Technical Ecstasy and Never Say Die wilt by comparison