《太平广记·卷二百零三·乐一》
掘开地面，得到一石。李嗣真将这段石头裁成四具悬乐，补上了乐悬所缺的徵音。
遂掘之，得石一段，裁为四具，补乐悬之缺。
Digging open the ground, he obtained a stone, Li Sizhen cut this piece of stone into four hanging instruments to make up for the missing notes in the hanging instruments.