Infamous prog rock band Yes released some of the most ambitious (some would call them pretentious) albums of the prog era in the first half of the 1970's. Tales From The Topographic Ocean (1973) and Relayer (1974) are two very good examples, and at least to my ears they sound pretty awful. 1971's The Yes Album is still ambitious as hell, but it does contain some good songs, of which the two-part "I've Seen All Good People is the best-known. It's essentially two good pop songs wrapped together, the two parts being called "Your Move" and "All Good People" respectively. Bear in mind that the line-up of Yes here is entirely different from the line-up that took "Owner Of A Lonely Heart" to the top of the singles charts around the globe in 1983.