What story does Xi's Song of Eternal Sorrow tell?

The love tragedy between Li Longji and Yang Guifei. According to the query of official website, Zhihu, the Song of Eternal Sorrow in Xi 'an refers to the large-scale live-action historical dance drama "Song of Eternal Sorrow", which is adapted from the poem of the same name by Bai Juyi, a poet in the Tang Dynasty, and tells the love tragedy between Li Tan, Qi Longji and Yang Guifei. Song of Eternal Sorrow is the first large-scale live-action historical dance drama filmed by China for Shaanxi Tourism Group. Based on Bai Juyi's masterpiece "Song of Eternal Sorrow", it fully tapped the scenic resources, used high-tech dance lighting, combined historical stories with live-action performances, and reproduced the love story between Li Longji and Yang Guifei in Huaqing Palace more than 1300 years ago.