Changdiao is the literal translation of the Mongolian word "Uritingduo". "Uriting" means "long" and "eternal", and "duo" means "song". In relevant books and papers, it is also directly translated as "long song", "long-tune song" or "grassland pastoral song". According to the historical origins of Mongolian music culture and the current status of musical forms, Changdiao can be defined as a folk song created by northern grassland nomads in animal husbandry production labor, sung during grazing in the wild and traditional festivals. The melody of Changdiao is long and soothing, the artistic conception is open, there are more sounds and fewer words, and the breath is long. The melody is very decorative (such as front appoggiatura, back appoggiatura, glissando, echo, etc.), especially the colorful singing formed by the singing method of "Nugula" (Mongolian transliteration, wave sound or ornamental sound). As early as more than a thousand years ago, the ancestors of the Mongolian people walked out of the mountainous forests on both sides of the Ergun River and migrated to the Mongolian Plateau. The mode of production also changed from hunting to animal husbandry, and the new folk song form of Changdiao was born and developed. Over a long period of history, it gradually replaced the neat hunting songs and occupied the dominant position of Mongolian folk songs, eventually forming the typical style of Mongolian music and having a profound impact on other forms of Mongolian music. It can be said that long tunes concentrate on the characteristics and features of Mongolian nomadic culture, and are closely linked to the language, literature, history, religion, psychology, world view, ecological view, outlook on life, customs and habits of the Mongolian people, and run through the entire history and social life of the Mongolian people. The basic themes of long tunes include pastoral songs, homesickness songs, hymns, wedding songs and banquet songs (also known as wine songs). The themes contained in long tune folk songs are closely linked to the social life of the Mongolian people. It is a must-sing song in all Mongolian festivals, wedding banquets, gatherings of relatives and friends, "Nadam" and other activities, which fully reflects the spiritual history and cultural taste of the Mongolian people. Representative songs include "Walking Horse", "Little Yellow Horse", "The Vast Grassland", "The Vast and Rich Alxa" and so on. The study of long-tune folk songs involves many branches of musicology. Its study and protection is actually the most powerful inheritance and protection of the grassland civilization and grassland culture with a long history.