There's a lot of debate about what kind of music is good/best as a trip "guide". by saying GUIDE I mean it, as it effects me in such a way that can direct you through trip.
I just wanted to share some music with you, some of you might already know it, some might not like it, just take it or leave it

first of all, BRIAN ENO!!!
http://www.youtube.com/watch?v=G0xZUjAGX9I
http://www.youtube.com/watch?v=6UDA_bAlu00
couple of links, you can find more..
his ambient music is very calming, but not too easy, not shallow at all. probably the best music I have found for tripping and meditation.

if you want to go a bit darker, deeper, try MURCOF.
http://www.youtube.com/watch?v=Dm9W83XJyGg
this album takes me to places even without any substance help, darkness and headphones.

I hope some of you might like it as much as I do. as one dear old hippie friend said:
"thingz ain't so good if not shared".

peace unity and love for us all.

Can't find streaming sources for any of these, but Unknown Spin by Charalambides has been pretty incredible on some moderate DMT trips. Might be a bit dark for some people though.

Centralia by Mountains is more positive and also has a lot of great songs for DMT trips, in particular the song Propeller.

White Rainbow is another artist with some good tripping songs. My favorite is probably Waves from the album Prism of Eternal Now.

momma dubbed parts 1&2 by puscifer is quite nice (couldn't find it online)
as is star shpongled banner (especially if you time it just right so you are exhaling just as the "oooooooh" starts)

these

Carbon based lifeforms- frog:
http://www.youtube.com/watch?v=w0AG_W0E2Nc

Metamorphosis- Mystical Dimensions:
http://www.youtube.com/watch?v=uTGaABCAd7Q

Ott- Around the world in a tea daze:
http://www.youtube.com/watch?v=M9P_qa96Iyk

Ott- Queen of everything:
http://www.youtube.com/watch?v=Y6ABIkH7m0s

sweet picks zero.

this is a fave for me, perfect length, and just an amazing song

Makyo - Soar Angelic
http://www.youtube.com/watch?v=3S_vG1ItazM

This is the kind of music I love for changa trips.. Frog is an incredible song. If you haven't tried it to this I think you also need to do that (Ogive by William Orbit) http://www.youtube.com/watch?v=WqOZzpydO10 it communicates an emotion i've never really heard in anything else that just sounds like god to me