This was to be Bain's final collaboration with Black Sabbath as guitarist Tony Iommi took over production duties for the band's next several albums.

Master of Reality — Black Sabbath | Last.fm Master of Reality — Black Sabbath | Last.fm

The second-generation rock audience (that is, those who went steady to “I Wanna Hold Your Hand” and got serious with Highway 62 Revisited) suffer mightily wrestling with the phenomenon represented by Grank Funk and Black Sabbath. It exhibited an uncommonly wide, vocal wah tone, blended with a sort of synthy, filter-like effect that lent the notes a distinctive voice and swell.I’m not saying that either that or the arrangement it’s set in is the new “My Generation,” but it is a rocking, churning addition to the long line of defiant, self-affirmative and certainly a little defensive songs that goes right back to the earliest whap and wail of rock ‘n’ roll.

Black Sabbath - Master of Reality Album Reviews - AllMusic

Beginning with the song "Sweet Leaf", it starts with Tony Iommi coughing before we are immediately thrown into some heavy riffs.Tony Iommi will forever be associated with the Gibson SG and its appropriately devil-horned body shape.