What are the similarities and differences between the "three schools" of poetry in the early Song Dynasty and the corresponding styles of Tang poetry?

Three-body poetry in the early Song Dynasty: First, represented by some powerful people at that time, such as Xu Xuan and Liu Yun, with Bai Juyi as the teacher, the poetry style was simple and vulgar, which was the mainstream poetry at that time. This was a vernacular poem. First, represented by Yang Yi and later Qian, with Li Shangyin as the teacher, it is the mainstream of poetry after Bai Style, which is called Style. First, taking Ye Wei, Lin Bu and other hermits as representatives, taking Jia Dao and Yao He as teachers, he wrote about his seclusion in a simple way, and his poetic style was austere, which was the wind of the late Tang Dynasty.

Tang poetry and Song ci are in the same strain. For example, poetry tends to be popular in subject matter and language, describing ordinary and trivial daily life and using vulgar slang. The biggest difference between Song poetry and Tang poetry is that Tang poetry emphasizes "image" and Song poetry emphasizes "meaning"; Tang poetry is a poet's poem, and Song poetry is a literati's poem. In other words, Tang poetry focuses on depicting images and images, and expresses emotional thoughts through the description of images and images. Associated with this feature, Tang poetry has distinct artistic conception, vivid emotion, concise language and implicit and intriguing performance. Song poetry focuses on the direct expression of emotional thoughts, and the description of "image" is secondary. Therefore, Song poetry often talks a lot, the language is not as concise as Tang poetry, and the performance is not too subtle. Tang poetry can basically be expressed by the poet's own natural language, while Song poetry is often expressed by allusions and predecessors' words, so the poets in Song Dynasty are first and foremost literati.