Procol Harum's second album garnered high expectations, as it arrived on the heels of the overwhelming success of the single "A Whiter Shade of Pale.". Gary Brooker's blues-based singing was the perfect foil for the majestic sweep of Procol Harum's two-keyboard attack (an approach employed by Dylan in the mid-'60s, and then fully explored by the Band) and Robin Trower's stinging guitar.