Clark,
Good stuff! An often forgotten and underrated piece of work.
If you are not all ready aware of this MP3 stream, check it out.
http://www.bluemars.org/voicesfwithin.php
Voices from Within celebrates pan cultural vocal music. (Yat kah, Lisa Gerrard, Ulali, buddhist monk etc.) A good introduction to music that is 'off the grid'.