《汉书·志·食货志上》
孟春的时候，居住在一起的人们将要分散，有人摇着大铃巡走于路上，来采集民间歌谣，献给掌管音律的大师，把音律排列在一起，告诉天子。
孟春之月，群居者将散，行人振木鐸徇于路以采诗，献之大师，比其音律，以闻于天子。
In the early spring, the people who live together will disperse, and someone will walk on the road and ring a large bell to collect folk songs and present them to the master in charge of music, arranging the music together and telling the emperor. 