No specific order. Some are better for Mushrooms, Some are better for Acid, Some are better for Ayahausca, and so on
Shpongle
Perpetual Groove (first song to listen to by them "Three Weeks")
Hallucinogen
Sasha & Digweed
Ganga Giri
Medeski Martin & Wood
Infected Mushroom
Skazi
Kyle Hollingsworth Band
Pretty Lights
Phish
Pink Floyd
Sound Tribe Sector 9 (STS9)
Michael Franti & Spearhead
Trey Anastasio
311
Panjea
Pnuma Live PA
Slightly Stoopid
EOTO
Emmitt Nershi Band
Fungus Funk
Raja Ram
Bassnectar
The Pnuma Trio
Lotus
Galactic
Mickey Hart Band
moe.
Widespread Panic
Oysterhead
String Cheese Incident (they dont play live currently)
Astral Projection
Psyside
Buckethead
Rodrigo y Gabriela
Animal Collective
Psilly-X
Astrix
Cornmeal
Tea Leaf Green
Underground Orchestra
Primus or Les Claypool
GMS (Growling Mad Scientists)
The Flaming Lips
Disco Biscuits
My Morning Jacket
Talamasca
Modest Mouse (Preferably the album The Moon and Antarctica)
Tool
U-Melt
Umphreys Mcgee
1200 Mics or 1200 Micrograms can be under both names but they're a little old
Kottonmouth Kings (for some reason they always work for me, listen to "Rip the Night Away","Fire It Up","Bring It On","Tangerine Sky" and so on)
Grateful Dead and Allman Brothers --- but they're old so you probably have them
----goes with the last but Phil Lesh + Friends Bob Weir & Ratdog Gov't Mule
Infinite Dimensions
Yonder Mountain String Band
Dark Start Orchestra (they are a Grateful Dead tribute, very good live)
Keller Williams
Dave Matthews Band
Space Cat
Zappa Plays Zappa
MGMT
Space Tribe
Chrystal Method
Of Montreal
Logic Bomb
Electric Universe
Also just about any reggae, especially live. The Wailers, any of the Marley's (except Damian Marley he's good just not that good for psychedelics)
Thats all I can think of now but there are sooooo many other good ones. The best way to find out is to go to a music festival like Bonnaroo, Rothbury, Wakarusa, Summercamp (NOT SUMMERFEST), eat some drugs and go from concert to concert. Even if you really like a band, try to hear just about everything. Keep a schedule on you and mark the ones you liked because you will easily forget a lot of them.