Day 49. The opening sound is a reversed piano chord that starts with a tight EQ in the middle and opens up as it builds. I used that sound a couple more times in the song. After getting the piano chords down, I layered a few strange sounds on top for effect.
This is a long shot - Really got interested in the MRI sequencing "noise" yesterday - it can be described as instrumental and structured in movements. Any ideas as to where actual recordings of the sounds as heard in the tubular chamber could be found?