has anyone ever heard of the caves in mongolia, where "double toning" with your voice illuminates the pitch

Question

black cave?... also do you agree that vibration is extremely powerful?

Answer 1

The polyphonic singing techniques of the Tuvan people have nothing to do with caves. It's something that you yourself can do with practice. Kargyraa is probably the easiest style, sygyt the hardest. And yes, it does rock. Here's some more info:

http://en.wikipedia.org/wiki/Overtone_singing