Progressive Rock was popular as early as 1969 when Album-Oriented-Rock stations roamed the face of the FM radio band. Music of this type became technically complex and sometimes classical in nature. Some of the most memorable Album sides to be played were "Supper's Ready" from the "Foxtrot" album by Genesis, both sides of "Thick as a Brick" by Jethro Tull, "Close to the Edge" and "Relayer" by Yes, "21st Century Schizoid Man" by King Crimson, "Karn Evil 9" by Emerson, Lake and Palmer, and "Hocus-Pocus," "Eruption," and "Hamburger Concerto" by Focus. This was the era of Robert Fripp, Rick Wakeman, Ian Anderson, Peter Gabriel, Keith Emerson, Steve Howe, Jan Akkerman: When the Giants ruled the FM Airwaves.
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Read more: the ListenSmart article on this style.