Music is an integral part of Mongolian culture. Among the unique contributions of Mongolia to the world's musical culture are the long songs, overtone singing and morin khuur, the horse-headed fiddle. The music of Mongolia is also rich with varieties related to the various ethnic groups of the country: Oirats, Hotogoid, Tuvans, Darhad, Buryats, Tsaatan, Dariganga, Uzemchins, Barga, Kazakhs and Khalha.