What does Pipa Xing point out in his poem?

"Xing" in Pipa Xing is a kind of classical poetry, which integrates songs and words, similar to Yuefu. Its syllabic meter is relatively free, and it uses five or seven ancient miscellaneous words, so the situation is full of changes.

Pipa Xing is one of the long Yuefu poems written by Bai Juyi, a poet in the Tang Dynasty. Eleven years of Yuanhe (8 16). This poem reveals the unreasonable phenomena such as bureaucratic corruption, the decline of people's livelihood and the burying of talents in feudal society by describing the superb playing skills and unfortunate experiences of the pipa girl, expressing the poet's deep sympathy for her and the poet's resentment at her innocent demotion.