In addition to the music songs produced by music officials in the Zhou Dynasty and presented by officials and scholars, there are many folk songs that were originally circulated among the people. There are different opinions about how these folk songs came to the court. Some scholars in the Han Dynasty believed that the Zhou Dynasty sent special poets to collect folk songs and understand the advantages and disadvantages of politics and customs. There is another saying: these folk songs are collected by musicians all over the world. Musicians are officials and experts in charge of music. They compose poems as their profession and collect folk songs to enrich lyrics and tunes. The pleasure of princes is dedicated to the emperor, and these folk songs are gathered in the court.