no less a light than phil lesh differentiated between psychedelic music and acid rock:
Phil defined it pretty good once. He said ummmmm . . . Oh, somebody asked him once what acid rock was — [and] which [kind] is psychedelic music. Okay, whatever, we’ll use those two as an equation — and he said, ‘Acid rock is music you listen to when you’re high on acid.’ Psychedelic music is music you listen to when you’re psychedelic. I think that’s what its real definition should be because subjectively I don’t think that there really is any psychedelic music, unless except in the classical sense of music which is designed to expand consciousness. (Reich 83-84)
even so, he as those who put forth thoughts hasn't defined psycedelic.
there's something more than just sound, pharmaceutical intake, etc., at work. but what is it?
"The power of accurate observation is commonly called cynicism by those who have not got it." — George Bernard Shaw (1856 - 1950)