some indigenous tribes (and others) use a mouth bow...
some may have heard it first by Buffy St. Marie
http://www.mouthbow.org/bow.html
http://www.youtube.com/watch?v=krx2MoTaAVo
http://www.youtube.com/watch?v=H3q79HFjhBg
Mouth music is featured in an "album" dancing with your shadow..
by bay area musician (wife of mudcatter Dave Swan) Pam Swan
http://www.pamswan.com
http://www.pamswan.com/Dance%20To%20Your%20Shadow%20CD.htm

one cut features Paul Pen~a, bay area blues man who mastered
tuvan throat singing...this may have been the last recording
he made.