Mr. Yu is a single-reed gas-sounding instrument of the Jingpo and De'ang peoples. In Jingpo language, " Bi" is a general term for air-sounding musical instruments, and "general" is double, which means a pair of air-sounding musical instruments with two pipes juxtaposed. Folks have the same style but different specifications. Rui Zuo, Ying is the small one. It is made of two...