宋書
He was a prominent scholar of the Liang Dynasty and the author of the "Book of Song", an historical work covering the history of the previous Liu Song Dynasty. He is probably best known as the originator of the first deliberately applied rules of tonal euphony (so called "four tones and eight defects" 四聲八病) in the history of Chinese prosody. He was also the leading scholar on the musical practices of his time and author of the essays on qilin and omenology.