I agree with the comment in this thread about FM Rock radio which was already in the mid-late 70s moving away from DJs choosing their own playlists to a codified playlist of set numbers of songs a week. I worked with Richard Neer (after his gig at WNEW-FM in NYC and when he was a sports talker at WFAN) and he would talk about this exact thing. He said that instead of what was played being "Rock" no matter the subgenre - all mixed together - it started to splinter. You weren't hearing Joni Mitchell into Beatles into Elvis Costello into Kansas. All of a sudden it started to become "Classic Rock".
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