Oh, yes, its unreal.
Just last weekend I consumed 4 blotter of LSD, later into the night I got out the LSDMT and the music.
I had been a listening a lot to the album 'Act of Depression' by Underoath
I like to choose music that I've recently had strong emotions attached with.
5 or so hours into the trip, it was time to smoke DMT, I turned on the music, took the hit, and things got very LSDMT.
I was very pleased with my choice of music, my most memorable part of this experience (I believe was near the end of the track 'a love so pure') was at the peak of the inhaled DMT.
The thrashing guitars seem to come to life, cutting in, grinding out, all in perfect time with the vocals, it was absolutely intense, and utterly wonderful.
All in all, listening to metal on LSD or DMT, or LSDMT, you just have to love the music, and let it speak for itself.
Edit: Also i'd like to point out that this type of music, though I do enjoy on a regular basis, would not my choice of music for the majority of the time while on LSD, I don't believe it would be good for my psyche either.. But as for the ego shattering moments, like combined with DMT or a strong peak, its just dandy. Aggressive guitar riffs.. Drop D.. DROP C! no wait.. drop A!