What singer Anne-Maria Hefele is performing is a style of overtone singing, and it's one of the most otherworldly sounding things I've ever heard. The whole thing is worth a watch, but the part at 3:25, where she moves the fundamental and overtone in opposite directions, had me shaking my head in disbelief.


I recommend listening to this with headphones – the overtone can seem to drop out at times, especially when played over tinny laptop speakers.

Overtone singing is also known as throat singing, of which there are several styles:

And here's what overtone singing looks like on an X-ray:



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