The Grateful Dead is one of my favorites, but then again, they're a lot of peoples favorites.
Psytrance, Goa Trance, Ambient, just most edm in general imo and anything that's not too dark/scary.
I'll also list a few artists I especially enjoy while dosing...
Shpongle (also "Hallucinogen" and "Younger Brother")
The Grateful Dead
Prometheus
Aphex Twin
Blue Planet Corporation
Safi Connection
I mean, I've listened to hardcore (angry, yelling, etc lol) on acid and while it didn't scare me, it just kind of killed my mood for a bit.
EDIT:yeah dubstep isn't bad on cid but the whole brostep thing ruined dubstep for me