There are dozens of ethnic minority groups in China have their own folklore: much of which contains valuable historical and cultural information as well as many unique myths.
Historic Chinese Legends, Tales and Idioms
Historic Chinese Legends, Tales and Idioms » Dui Niu Tan Qin - Playing the Zither for a Cow
There are many different Chinese idioms out there that people use today in modern Chinese. "Dui Niu Tan Qin" literally means, "Playing the Zither for a Cow." It means that some people will just never understand or appreciate certain things.