He played at my high school "canteen" in '68 or '69. One thing I recall was his wife, sitting next to him, singing the lyrics into his ear, just off the beat. If you listen closely to some of his songs you can hear this.
I have no idea how I forgot about this one:
My favorite cover of that one is by Them. I’m partial to Van Morrison.
https://www.youtube.com/watch?v=mgM2XLjnGNY