Mongolian throat singing
The whistling you’re hearing in the background of this video is coming from the singing man, it’s the strange and entrancing technique known as “throat singing.” The layers of sound are achieved by training oneself to use the fake set of vocal cords called the vestibular fold which covers the more delicate vocal cords that you actually do your talking with. This tough, thick vocal cord is still flexible but harder to vibrate and therefore usually emanates either a deep drone or a delicate whistle.
