What was the calligraphy style of the Tang Dynasty? What was the style of calligraphy in Song Dynasty?

The calligraphy style in the Tang Dynasty was legalist, represented by Yan Zhenqing, Liu Gongquan and Ou Yangxun. The book style in Song Dynasty is the style of attaching importance to books, represented by Su Dongpo, Huang Tingjian and Mi Fei. Of course, the Song Dynasty inherited the tradition of the Tang Dynasty, and the main popular and appreciated "calligraphy" was running script.

The Tang Dynasty prepared a model for the Song Dynasty, in which the Song Dynasty played a more arbitrary role. For example, Song Huizong's "Thin Gold Style" is almost all regular script. There were many literati who were officials in the Song Dynasty, and the society admired literati. Scholars like freedom and openness, and they also like being close to the people. So their mental state is also free and unrestrained. We can see such a free and unrestrained reality from the poems and paintings in the Song Dynasty. Then, the literati's spiritual sustenance calligraphy will certainly reflect the taste of "depravity"