This is related to the strength of the brokerage culture country at that time. The Sui and Tang Dynasties were the most prosperous and prosperous period in the world. At that time, there were envoys from the Tang Dynasty to China, diplomatic envoys to visit, and ministers from the Sui and Tang Dynasties, which was a combination of Chinese and Western cultures. Sui and Tang dynasties were the heyday of feudal society, and the people were relatively simple. In terms of national treasury and production, technology and quality passed the test. Working people gain knowledge and wealth through labor. Under the condition of perfect culture, economy and strength, there is no reason why folk music should not develop!