A funny coincidence here that Ellijah Wald's new book should come up here when I was just thinking about buying his book on Josh White--

I've always maintained that, in a way, The Beatles actually did kill rock and roll, because up until then, Rock and Roll was dance music, and it was damned hard to dance to their records.

That said, Ron Davies may not be old enough to remember, but Sgt. Pepper and Psychedelia opened the door to free radio which meant that it was suddenly possible to listen to all kinds of music, and not just the top 20 pop hits in a tight rotation.

And psychedelic music was just folk music plugged in, anyway--