Which poem can be called the first of the seven wonders of the Tang Dynasty?

As far as the achievements of the seven wonders are concerned, Du Mu was the first in the Tang Dynasty. As far as the four-line single is concerned, what I admire most is Wang Zhihuan's Liangzhou Ci. Although there are not many works by Wang Zhihuan, more than one is well known to women and children, which is a blockbuster. Personally, I appreciate Wang Zhihuan's "Liangzhou Ci", because compared with Li Bai's "Early Release of Baidicheng", Wang Wei's "Chengwei Qu", Wang Changling's "Out of the Great Wall" and William Wang's "Liangzhou Ci", Wang Zhihuan's "Seven Unique Poems" is the masterpiece that can best show the magnificent atmosphere of the prosperous Tang Dynasty. For example, "The Yellow River is far above the white clouds, and an isolated city is Wan Ren Mountain", the boundary of the prosperous Tang Dynasty and the magnificent scenery of Guanhe River can be outlined. As for "why should the strong flute complain about the willow, the spring breeze is just like Yumenguan", people always feel sad when they think about it. The style of this poem is also a sad feeling between heaven and earth-however, the style of the Tang Dynasty can be described in this way.