45. Triumvirat, 'Illusions on a Double Dimple' (1974)
This German trio is often branded as a clone of Emerson, Lake and Palmer, which is an unfair, if understandable, dismissal. Propelled by Jürgen Fritz's keyboard arsenal of grand piano, Hammond organ and Moog synth, the band were clearly versed in the science of Brain Salad Surgery. But what they lacked in originality they made up for with mind-boggling chops. Triumvirat's second LP, 1974's Illusions on a Double Dimple, is a prog-rock masterwork, incorporating operatic choirs and bursts of pop levity into two seamless, side-spanning epics. They softened their approach later in the decade in a quest for commercial stability — and failed miserably. But thanks to Illusions, Triumvirat's legacy among the prog firmament was secure. R.R.