I always listen to music during my trips. But finding the right music is very difficult.
My first DMT experience I decided to listen to loud psy trance because I enjoy it with other types of psychedelics. This turned out to be a very bad idea.
With some trial and error I found the perfect album and perfect song that really helps guide my trips to a positive peaceful place.
Album: M83 - Saturdays = Youth
Track: M83 - Midnight Souls Still Remain (11:10)
The album is very good in general. Very nice to listen to while laying in bed and integrating. They really load on tons and tons of reverb to give all the songs a very dream like quality. Midnight Souls Still Remain is the perfect song because it is devoid of any percussion instruments and is very simple and wont distract you, it is basically some layered pads which alternate back and forth between two different chords for 11 mins straight giving a very ambient feel. The length of the song is the perfect amount of time to take a trip around the universe and be back in time before the next track starts. I will usally lay in bed integrating and listen to a couple more tracks on the album with a nice smile on my face.
One of the best things I like so much about the album is it reminds me of hazy summers spent as a kid. Very nostalgic.
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From Wikipedia:
Saturdays = Youth, M83's fifth studio album, was released in April 2008. It was recorded with Ken Thomas (known for his work with Sigur Rós, The Sugarcubes, Boys in a Band, Cocteau Twins and Suede), Ewan Pearson (who has also produced for Tracey Thorn, The Rapture and Ladytron) and Morgan Kibby (of The Romanovs). The album features a more focused approach to song structure and form, and Gonzalez stated that the main influence of the album came from music of the 1980s: "I think that 80s music is such a brilliant period for music history. It was the occasion for me to do a tribute to this 80s music, but also a tribute to my teenage years. Because the main theme of the album is being a teenager, and being a teenager means a lot to me."
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I have tried listening to bands like Cocteau Twins and they sort of work. I think your best bet is going with some minimal ambient music, long drawn out pads, devoid of percussion or much traditional structure, something you can easily ignore but sets a pleasant tone.