Album-Oriented Rock. A style of music associated with an FM Radio format in which album tracks, rather than released singles, are played. It's roots originate in the underground-FM stations of the late 1960s - early 1970s, such as KPPC-FM (Los Angeles) and WNEW-FM (New York City). Aimed at young white males aged thirteen to twenty-five, the AOR format featured hard rock bands, such as Led Zeppelin and Deep Purple, and art rock bands, such as King Crimson; Emerson, Lake, and Palmer; and Pink Floyd. AOR generally excluded black artists.