There we can agree. I think it was first said by Robin Williams. Unfortunately it may be the case that he didn’t strike the fine balance between sex, drugs and rock ‘n roll, and put too much emphasis on the drugs. Cocaine in particular. People who used a lot of that have lost their memories.
I would remind you of the folk scene in Cambridge Ma and the germination of what would become the full fledged folk scene. That was early sixties. Recall also that Ken Kesey (along with Neal Cassidy) considered himself the link between Beatnics and hippies. Point being, the roots of the “sixties” run deeply into the fifties. Kesey’s MKULTRA experience with LSD happened in the fifties.
Folk music....It was HUGE in the 1930s-'40s and had a BIG following with teen. He collected and sang traditional, very old folk music. And I know all about him and this, because when Folk Music made a BIG comeback in the late '50s, I was a fan and my mother who had been a big fan if R D-B, told me all about him. :-)
There was a BIG Folk scene in Greenwich Village, prior to the likes of THE BROTHERS FOUR, etc. and Joan Bias, who began ONLY singing for real, OLD folk music from the UK.
It was THE BEATS ( also stinking COMMIE leftists and dopers), who began the decade plus later (1968) Hippie/dippy, crapola of late '60s!
So yes, INDEED, you did pinpoint the correct time line and progression...you just didn't add the NYC scene, which was HUGE!