Check out this really interesting piece called Memory of The Ferrofluids by Red Fog. I found this on SoundCloud the other day and have listened to it a few times. This piece is best listened to with the lights out. It has a really heavy, claustrophobic kind of sound that almost makes you feel like you’re drowning.  If you can bring yourself to surrender to this feeling it can bring you to a somewhat altered state of consciousness. It’s kind of like being in an isolation tank but with sound effects. Give it a listen and let me know what you think of it.