The classic Black Sabbath lineup of Tony Iommi on guitar, Geezer Butler on bass, Bill Ward on drums and Ozzy Osbourne on vocals produced a classic album - but not without significant input from Iommi.
Queen's second album, Queen II, was released in 1974. On it, you can hear Brian May's unique guitar tone as it begins to develop into the huge stadium rock of the British band's subsequent albums...