"How Fortunate The Man With None" by Dead Can Dance.
Also featured in this 80 min. ambient music mix I've uploaded to Google Video: http://gaminghttp:// video.google.ca/vide oplay?docid=57764233 5941286902
The most creative and ultimately beautiful scene (in my opinion) in Ken Russell's 1980 film Altered States. The quality of this clip doesn't seem to be the best, especially near the end (where it counts), so I'll play around with the software a little more and see if I can upload a better version later.