경덕왕 18년(759)에 대악감으로 개칭했다가 혜공왕 12년(776)에 다시 음성서로 개칭하였다.
In the 18th year of King Gyeongdeok (759), it was renamed as Daeakgam (大樂監), and in the 12th year of King Hyegong (776), it was renamed to Eumseongseo.