Song of Eternal Sorrow is a long narrative poem by Bai Juyi, a poet in the Tang Dynasty. The whole poem vividly describes the love tragedy between Xuanzong of Tang Dynasty and Yang Guifei. With the help of historical figures and legends, poets have created touching stories and reproduced the truth of real life through their own artistic images, which have infected readers for thousands of years. The theme of this poem is "Song of Eternal Sorrow". This poem has had a far-reaching influence on many literary works in later generations.
Seven-character line of songs is a special style, and the words "song" and "line" often appear in the title of poems. It is a poetic genre that can be sung with music. The number of general sentences is uncertain, and the number of words in each sentence is not fixed. Can be mixed with three or five sentences, but mainly seven words. The purpose of seven-character song creation is to imitate the lyrics, and its style is determined by the lyrics suitable for singing.