What is the formation and development process of "folk song style" new poetry?

After the literary rectification, many writers went to the countryside to collect and sort out folk songs. They walked into the dazzling treasure house of China folk poetry, and were simply stunned. "These wandering in the sky, going to the Western Heaven and playing Yingying really fascinate us and make us reluctant to leave them. These simple, lively and fresh songs, as well as this village with endless songs." Writers who once worshipped Homer, Dante, Byron, Shelley, Goethe, Heine and even Baudelaire and Eliot are now fascinated by this beautiful and vibrant folk song, which has not been found around them. They dug and absorbed eagerly, and soon, a refreshing poetic style appeared in the history of modern poetry. This is the new poem that was later called "folk song style", which matured in the rural areas of the liberated areas in the second half of the 1940s.