Huun-Huur-Tu (Tuvan: Хүн Хүртү Khün Khürtü, Russian: Хуун-Хуур-Ту) are a music group from Tuva, a republic of Russia situated on the Mongolia–Russia border. The most distinctive characteristic of Huun Huur Tu's music is throat singing, in which the singers sing both the note (drone) and the drone's overtone(s), thus producing two or three notes simultaneously. The overtone may sound like a flute, whistle or bird but, is solely a product of the human voice.