The title of this poem is Yizhou Song. According to Yizhou Yuefu Poetry Collection, this song is "Xijing Festival, Gai Jiayun enters." It can be seen that this poem was originally the lyrics of Jin Changxu's local music "Yizhou Song" for the Western Regions. Later, Gu Tao of the Five Dynasties selected this poem into his Selected Poems of Tang Dynasty (Lost), and changed the title to "Spring Complaint" according to the poem.
Gaijia's operas, Jin Changxu's words, I guess that's the way it is.