From the perspective of poetic style, what kind of poetry does Shu Dao Nan belong to?

The difficulty of Shu Dao is an old topic in Han Yuefu, which belongs to the "tonal song" in "Harmony Song". Guo Maoqian quoted Yuefu's explanation in Volume 40 of Yuefu Poems: "South of Shu Road" indicates the resistance of Tongliang Yulei (both of which are the names of Sichuan mountains). From Wendi to Zhang in the early Tang Dynasty, many people wrote poems on this topic. Li Bai's poem, although it also describes the difficulty of Shu Dao along the old topic of Yuefu, is richer in content and more positive in ideological significance. Describing the sudden emergence of Shu Dao and its dangers is the main content of this poem, which occupies most of the whole poem. Li Bai loves his hometown of Sichuan and the mountains and rivers of the motherland very much, and many of his poems strongly express this emotion. The same is true of Shu Dao Nan. Although, in order to convince his friends, he tried to exaggerate and describe the dangers and horrors of Shu Dao, his sincere love for the mountains and rivers of his motherland made him involuntarily devote all his enthusiasm to Shu Dao in his works. While describing the dangers and horrors of Shu Road, he also wrote its abrupt, majestic, powerful and insurmountable majestic momentum. It shows the magnificence of the mountains and rivers of the motherland.