What is the Mongolian long song style called urtiin duu?

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Wide autumn valley with golden grass in the foreground and low, tree-covered mountains of the Greater Khingan Range in the distance under a clear sky. — Inner Mongolia Da Hinggan (Greater Khingan) Range, southeast of Hailar, Inner Mongolia Autonomous Region, China.

The Mongolian long song style is known as urtiin duu. This traditional vocal style is characterized by its drawn-out, free rhythm and extensive melodic ornamentation.12

Recognized by UNESCO as an "intangible cultural heritage," urtiin duu is a significant aspect of traditional Mongolian life, often performed as a form of entertainment, historical recollection, and group expression during social gatherings. When performed, the singer is frequently accompanied by the horsehead fiddle, which provides simultaneous variations on the melody through a technique known as heterophony.12