The New Discussion of Shen-gu;

In oracle bone inscriptions, new and old "xi", means ancient and modern music; "gu" means blind people; "yong" and "mei" refers to ode and refined poem respectively.

There are some discussions about the forming Zuo Zhuan,including oral narratives of history of Gu.

On Tsunzi s Cheng Xiang from History and Culture of the Blind:More Comments on Cheng Xiang for Folk Song Style;