Re: Progressive Rock...?
^That's as good a choice as any...many bands were doing weird things with music in the late 60's...most of it seemed more psych than prog to me , but again it comes down to names and semantics and how one wants to classify stuff.
Moody Blues with Days of Future Passed....Procol Harum with Whiter Shade, Traffic with Mr Fantasy, The Nice with Davjack....and others.
Some even cite Sgt Pepper as the first 'prog' lp.
But to me the first full blown one was King Crimson's debut in 1969...to me this was the first example of hitting all the buttons that later stamped what prog rock was....but it's all subjective in the end.