《明史·志·卷三十七》
英宗、景帝、宪宗、孝宗时代，宫廷乐器悬挂四面的制度只是文字上有记载而已。
英、景、宪、孝之世，宫县徒为具文。
During the reigns of Emperor Yingzong, Emperor Jingdi, Emperor Xianzong, and Emperor Xiaozong, the rule of hanging musical instruments on all four sides of the palace was only recorded in documents.