For me it's something like:
Pot - Blues, Classic Rock, Random Top 40
Coke - Progressive metal (e.g., Dream Theater)
Shrooms - Synthpop, darkwave, psytrance, any music with atmospheric sounds and a lot of sliders and knobs. Bonus points if they use monosynths and a didgeridoo. (I'd like to build a didgeridoo out of PVC pipe and spend a weekend camping in the woods with Ayahuasca!)
PEAs & Tryptamines - Techno, especially trance and psytrance.
LSD - The music of the spheres. Pre-recorded physics lectures. Operetta. Musicals.
As a guitarist I've also found that creating music is especially fun on most drugs. I come up with some really twisted shit playing guitar on psychedelics. I can definitely feel what Jimi was channeling. When I'm baseline I worry so much about melody and progression, but on psychedelics I seem to gain a better sense of the wholeness of the instrument, and realize that I can use the noise and dissonance of it as well. I can never seem to let go like that when I'm baseline.