Which poem of Zhang, a poet in the early Tang Dynasty, established his position in the history of Tang poetry?

At present, there are only two poems about Zhang, among which "Moonlit Night on a Spring River" is the most famous, which has established his position in the history of Tang poetry. There are thirty-six sentences in this poem, which depicts the attractive scenery of Jiangnan spring night with beautiful writing, and also entrusts the homesickness of the wanderer. The whole poem has a clear artistic conception and beautiful melody, which is a swan song throughout the ages. Among Zhang's poems, Moonlit Night on a Spring River is a famous work. It follows the theme of Yuefu in Sui Chen's period, and expresses its touching feelings of leaving home and philosophical understanding of life. The language of the poem is beautiful and moving, and the melody is euphemistic and long, which is completely different from the over-packaging of court poems, giving people an ethereal, quiet, natural and fresh feeling.

The poem "Moonlit Night on a Spring River" is the title of Wu Sheng, a Yuefu. It is said that it was written by Chen Houzhu in the Southern Dynasties, but the original lyrics have not been passed down from generation to generation. Later, Emperor Yang Di also wrote this song. Zhang's poem is a quasi-topic poem. The tune of this poem is very different from the original, but it is the most famous. The specific creative background can no longer be studied. The whole poem is mainly described in the background of spring, river, flowers, moon and night, with the moon as the main body. "Moon" is the core part of the whole poem, which links the whole poem together, and the poem describes emotions with the birth and fall of the moon. In the moonlight, natural scenery and characters are perfectly blended together to form a complete poetic image, which shows a moving picture to the world. This "picture scroll" is dominated by light color, with ink outline, just like an elegant ink painting, which makes people relaxed and happy.