Roots Reggae can be pretty nice while tripping - I remember listening to Ken Boothe - Richard Cory about a hundred times in a row on a trip once. However it wasn't a strong trip, it was more kind of a small trip with a few beers in advance (dunno if the attachment works)
Another song I'd really like to check out while tripping is Crumblenaut by Younger Brother - just found it a few days ago. I can imagine this is a perfect soundtrack when you smoked a lot of oily, black hashish
Oh and by the way when I'm tripping I often love music that I normally don't consider very interesting. A good example is the Ozric Tentacles which I find nice when I'm sober. Nice, nothing more... Then I listen to the same album on a good trip and suddenly it's a musical revelation... there's so much detail in their songs, you can't listen to them while driving a car for example, then you'll just hear some boring elevator music. But with 6grams shrooms the whole thing opens up like a beautiful flower.
One time I thought I had discovered the best Zion Train track ever, listened to it a dozen times while tripping. I listened to it again the next day and was very, very disappointed because it was plain boring and repetitive ("praying mantis" from the '94 Siren album). It's meditative music at its best, good for trips and meditation, but not so interesting when you're sober.
Space, I listened to Venetian Snares - that is some crazy shit! You listen to that when you're on a trip? :shock: Sounds like Beethoven on pcp
Don't get me wrong, I like it, it definitely has a lot of power, but as a soundtrack for tripping? I don't know...