The FM Rock Radio you reference was called Album Oriented Rock in the trade and it changed the rock landscape from a song driven and label driven one to an artist and full album one and The Beatles deserve credit with Sgt. Pepper and Magical Mystery Tour beginning the migration from single 45's to 33 LP's, liner notes to connect the listeners even better to the artist. It changed the way music was composed and the artists were no longer limited to time with their compositions. And the programmers and music directors were no longer the tail, they became the dog as they selected the tracks to be played instead of being "served" by the labels. Top 40 radio had time limits because the rotations on the music were so hot that burn accelerated and tolerance for a song they didn't like or were burned on meant button pushing. Those stations had a lot of people passing through but they didn't stay for long as opposed to an AOR station that had fewer listeners but far more loyal and would stay for much longer periods of time. The other major difference was this music was created by these artists, most of the pop was created by the hit machine, just like most country. Pop couldn't play the entire Hotel California and left out the best part. The payoff for us was B sides were not plentiful in AOR and one hit wonders were rare. If programmers could only find one track on an album they felt good about playing, that band was not long for the music world. Some of my favorite songs from my favorite groups were not the "hits" and I couldn't wait to drill down into an album to see what I could discover. And then there were some bands that I could not just listen to part of the album and others, like the first Yes album, I had to actively listen, I couldn't do anything else except maybe light a candle since I already had the lighter lit. I can remember some albums the very first time we'd listen to them and the impression they made. There are some true masterpieces that have withstood the test of time. They're like Classical compositions and are forever etched into my memory.