Musical Map of China: Hearing Inner Mongola - Mongolian Urtin Duu (Long Song) 中国音乐地图：听见内蒙古 - 蒙古长调

Urtiin duu (Mongolian long song) is a traditional Mongolian vocal genre characterized by extremely long, sustained syllables, wide melodic leaps, and richly ornamented, melismatic lines. It is usually performed solo with free, rubato timing and accompanied by the morin khuur (horse-head fiddle), although unaccompanied renditions also exist. The term "long" refers to the prolonged duration of sung syllables and the expansive melodic lines rather than to the length of the piece itself. The melodies often use pentatonic frameworks, expansive ranges, and expressive techniques such as portamento, glissandi, and subtle microtonal inflections to evoke the vastness of the steppe, horses, and nomadic life. Urtiin duu is a pillar of Mongolian musical identity and has been recognized by UNESCO as part of the Intangible Cultural Heritage of Humanity.