What are the theoretical propositions and historical contributions of the Crescent School?

In order to adapt to the aesthetic principle of "driving emotion with reason and restraining imagination with reason", Crescent School put forward the theoretical proposition of "metrical new poetry", emphasizing that the most important aesthetic characteristics of new poetry should be "harmony" and "uniformity", which is prominently manifested in Wen Yiduo's "three beauties" of poetry-musical beauty (emphasizing music and elegance). Its historic contribution lies in correcting the weakness of prose culture in the early stage of new poetry creation.