How to understand the artistic features of Li He and Bai Juyi's poems?

(1) The techniques used in music description are different: "Elegant Li Ping" mainly describes the artistic effect of music, but it doesn't pay much attention to the ups and downs of the music melody itself. It only uses two sentences: "Kunshan is as broken as a phoenix, Furong tears and Xianglan laughs" as a side lining. Pipaxing mainly describes the strength of timbre through metaphor, with "this Jiujiang official." My blue sleeves are wet "as a side lining. The first ten sentences of "Listening to a Clever Teacher Playing the Piano" describe the ups and downs of the piano sound and describe the artistic conception expressed by music with image metaphor, which is a direct description; The last eight sentences express the feeling of listening to the piano in a lyrical way, which is a side contrast. (2) Different styles: Li He's Poems of Li Ping is purely a description of music, without the poet's emotional sustenance, and its style is bleak, romantic and magnificent. Bai Juyi's Pipa is a narrative poem, and it is also lyrical when describing music. Pipa girl's modal movements and the author's life experience are interspersed among them, and her style is simple and sentimental. The first ten sentences of Han Yu's Listening to a Skillful Teacher Playing the Piano are about the sound of the piano, and the last eight sentences are about the poet's feelings when listening to songs. As for the life experience caused by the sound of the piano, it is not straightforward, so the style of this poem is sad and implicit.