As long as we're talking LSD-related music, one of my favorites is Tool's "Rosetta Stoned".
I'm mostly a blues/rock guy, but for LSD-related stuff, I'd probably go with Shpongle. Star Shpongled Banner is probably my favorite song by them
Oh yeah, Shpongle! Simon Posford and Raja Ram. Dancing to them in Amsterdam was my first exposure to trance. Also Younger Brother. And damn, Bassnectar! Plus An-ten-nae, PANTyRAiD and other trance and acid crunk.