"Yangguan Sandie" is a famous qin song in the Tang Dynasty. It is based on Wang Wei's poem "Send Yuan Ershi to Anxi". Because of the two names of "Yangguan" and "Weicheng" in the poem, it is also called "Yangguan Song" and "Weicheng Song". "Yangguan" has also become synonymous with sending friends to sing. Three stacks refers to the three stanzas of the whole piece, basically a melody change repeated three times.

Wang Wei's poem was widely circulated in the form of songs in the Tang Dynasty, and was included in "Izhou Daqu" as the third paragraph. The lyrics of Daqu in the Tang Dynasty mostly used five or seven-character quatrains or four lines of rhythm poems, and used the chorus method of repeated chanting to give full play to the meaning of the poems. At the end of the Tang Dynasty, the poet Chen Tao once wrote a poem and said: "The song is the third time in "Izhou", singing the words of Youcheng Zhengshu." This shows that it has a certain connection with the Tang Dynasty Daqu. Later, it was composed into qin music, and it has been handed down to this day in the form of qin songs.

Wang Wei's poem was written to send a friend to serve outside the customs: "Weicheng is light in the rain, and the guest house is green and willows are new. I advise you to drink a glass of wine, and there is no old friend when you leave Yangguan in the west." Some words, strengthen the sentiment of farewell. "Yangguan Sandie" has been passed down to future generations, and there are many kinds of scores and singing methods. There are three kinds in Song Dynasty alone. The great writer Su Shi once said that he had heard two different scores played. However, the music scores of this piece before the Yuan Dynasty no longer exist. In the early Ming Dynasty, Gong Jigu compiled the "Zheyin Shizi Qinpu" (1491), which included the "Yangguan Sandie" piano score.

According to "Introduction to Qin Studies" (1864) compiled by Zhang He in the Qing Dynasty, the whole piece is divided into three sections. Basically, one tune is used to change and repeat three times. Each stack is divided into another superimposed "Qinghe Festival when Spring" as a quotation, and the rest are written in Wang Wei's original poems. The latter paragraph is the newly added lyrics, each stack is not the same. From a musical point of view, the latter part is somewhat similar to the nature of the chorus. The tone of this qin song is simple and full of passion, especially the octave jump in the latter part of "Xing, Xing", and the continuous and repeated presentation of "Likushang", etc., with real affection, excitement and depression, It fully expresses the author's sincere feelings of infinite care and nostalgia for the friends who are about to travel far away.

There are more than 30 kinds of qin sheet music in Yangguan Sandie, and they are somewhat different in structure and tune. The whole tune is simple and full of passion, with a touch of melancholy, with the repetition of homophony as the ending sound, which strengthens the meaning of parting and caring for friends who travel far, which is very consistent with the theme of the poem.