In this video, a singer uses an overtone technique -- similar to Tuvan throat singing -- to produce a lovely rendition of "Amazing Grace." If you are not used to listening to overtone singing, listen for the high-pitched flutey sound that is created OVER the sound that he's making with his mouth. Don't focus so much on what he's doing that you miss the actual overtones. You might need to close your eyes.
Totally with you there, gail. I think it's amazing to listen to.