And in regards to Marks earlier comment about guitar styles, see the Grateful Dead's first album, the guitar crescendo on "Viola Lee Blues"
but that was released 11 months later. You may well have heard it before April of '66, but not many others did.
Reason I am asking is that it is always a challenge for me to recreate the chronologies of Pop Culture things like this that happened before my time & which were not usually documented with unnerring accuracy.
thanks for the correction; for some reason, since this is the 40th anniversary of the Dead, I assumed it was earlier before checking my facts. Jim McGuinn (as he was then called) really did expand the sounds of the guitar, didn't he? 12-string guitars had existed for a long time, but the first time we heard Mr. Tambourine Man, boy, that was special.