Correct me if I'm wrong but the first stand alone rock FM station would have been KMPX in San Francisco although KYA-FM tried and failed a few years earlier using more middle of the road rock. The hippie format (for want of a better term) was copied all over the country in one way or another. KRLA had a staff poet, I might be remembering a different station but I think KRLA would sometimes slip some symphonies in with the rock just to keep things unpredictable and interesting. There were ride boards: "Sunshine is driving to Berkeley and can take two along for gas money", that kind of thing. Again I could be wrong but I think the first FMs to break through financially were the hippie stations, until they came along FM was basically a holding operation--a good way to make a small fortune given that you had started with a big one. There are some very interesting stories from that era of radio, its a little surprising they are actually remembered. This could have been considered free form radio, playing acid rock, introducing groups like Quicksilver, Country Joe & The Fish, Janis Joplin, Hendrix, et al. and airing the Beatles and Stones more esoteric and experimental music.