ㄩㄝˋyuèㄐㄧㄥjīng

  1. 六經相傳或謂本無·禮經通論·本無》:本無。……,……三百篇,……先儒樂經不知六經。」

Book of Music, said to be one of the Six Classics lost after Qin's burning of the books in 212 BC, but may simply refer to Book of Songs 詩經