The first half of the 1970s was an especially fertile period for British progressive rock, laying claim to classics such as Tarkus, Selling England by the Pound, Larks' Tongues in Aspic, The Dark Side of the Moon, and Thick as a Brick. Collectively these and other works represent the best British progressive rock had to offer. Yet, it's Yes's 1972 three-track masterpiece, Close to the Edge, that presents a...