There's a bunch of great live albums recorded back in the late '60's that are great stoner music. I love the live music as it always seems to have a lot more feeling than the over produced studio stuff. Plus the bands do a lot more jamming since they're not confined to shortradio play songs. Not to mention that most of the bands were stoned, trippin or both when these were recorded. A few that come to mind:

Santana-Live at the Fillmore '68
Jefferson Airplane-Bless It's Pointed Little Head
Grateful Dead-Live
Jimi Hendrix At The Fillmore East
Quicksilver Messenger Service-Happy Trails(Live)
Pink Floyd-Umma Gumma (First Disc of the two disc set is receorded live)