I do not find that psychedelic enhance creativity. Perhaps for some ppl, though.
Personnally I'm far more creative/passionnate/productive about music when I'm not in a drug (psychedelic or not) period...
The only stuff I need to be creative is to be passionnated/a bit obsessed with the stuff I'm into. When I'm into drugs my head think DRUGS DRUGS DRUGS DRUGS, I can't be creative with stuff like music.
Edit : I moderate a bit my remarks : it's true for myself that psychedelic open in some way some new way to be creative, you get new data, some new view and new type of sensation. I'm generally reluctant to admit that, I'm not in the "psychedelic open your mind" stuff, but when I go out my drugs periods (3 month or something in general), I go back little by litte in music, and I've to admit that even if psyche increase not directly creativity, it can give some new type of idea.