Tuvan Throat Singing - Huun Hur Tuu (Tuva, Mongolia)

Throat singing (or overtone singing) is designed to integrate the sounds of nature (birdsong, water running, hoofbeats, etc.) into vocals. The goal of overtone singing is to generate two (or more) tones simultaneously as you sing...one is usually a drone and the others are high-pitched tones, mimicking the sounds of nature. 

Tuva (just outside of Mongolia) is "well known" (as well known as throat singing can be in modern culture) as the centre of throat singing, although other Mongolian (and Inuit in Canada) cultures also practice variations on the form.

Huun Hur Tu are one of the best practitioners of this form of music. The other best know group is Yat Kha, who have even recorded Western songs in the Tuva style (including Love Will Tear Us Apart originally by Joy Division).

Personally, I love this kind of music although for many it is an acquired taste.