《晋书·志·第六章》
漠末天下大乱，乐工亡命奔散，律吕法度都毁散殆尽。魏武帝时得到了乐人杜夔，命他考定乐器音律。
汉末天下大乱，乐工散亡，器法堙灭，魏武始获杜夔，使定乐器声调。
At the end of the Han Dynasty, the world was in chaos, and the musicians were scattered around the world, and the laws and laws of the scales were all destroyed. During the reign of Emperor Wu of Wei, he obtained the musician Du Kui and ordered him to examine and determine the musical instruments and musical scales.