Some of my favorite songs when I'm high:

Comfortably Numb~ Pink Floyd (Makes you feel like you're floating)
Planet Caravan~ Black Sabbath (Just fuckin awesome...turn this way up)
Plainsong~ The Cure (Trippy and Beautiful)
Tomorrow Never Knows~ The Beatles (Sweet when you're comming up)
Reflection~Tool (Tool is god to me)
Roots, Rock, Reggae~ Bob Marley (Rediculously chill song)