《吕氏春秋·纪·季夏纪》
郑卫之声、桑间之音，这是淫乱的国家所喜好的，是道德袁敢的君主所高兴的。
郑卫之声、桑间之音，此乱国之所好，衰德之所说。
The music of Zheng and Wei and the songs of the mulberry groves are favored by licentious states and enjoyed by morally bankrupt rulers.