What are the folk songs of the Northern Dynasties? What does it reflect?

Folk songs in the Northern Dynasties are the most successful part in the poetry of the Northern Dynasties. It directly inherited the tradition of Yuefu folk songs in Han Dynasty, including pastoral songs, love songs and battle songs, and widely reflected the social reality in the north and the life fate and spiritual temperament of the people in the north, forming a bold and vigorous style.