The Bi is a national musical instrument that is popular in Yunnan Province, Xishuangbanna Dai Autonomous Prefecture, Dehong Dai and Jingpo Autonomous Prefecture, Lincang, Simao and Hainan Province.

As for the origin of Bi, there is a legend in the Dai family: there was once a young man of the Dai nationality who loved to sing, but he always felt that the singing was monotonous, so he was very distressed. One day when he went up the mountain to chop wood, he accidentally fell into a deep pit. In the pit lived a big bamboo rat who could speak human language. The young man begged the bamboo rat to save his life. The Bamboo Rat tried his best to do nothing, and finally took off the leather tube on his tail, bit seven holes, and nibbled a reed leaf from the wall of the pit to make a reed on it. Bamboo rat blew on the reed, and suddenly there was a wonderful sound of music. The young man was overjoyed, and he sang loudly. He sang in harmony, and the singing was beautiful and beautiful. This attracted all kinds of birds, and they all rested on a yellow bamboo branch outside the pit. There were more and more birds, Huang Zhuyue bent down, and the tip of the bamboo dipped into the pit. The bamboo rat asked the young man to grab the top of the bamboo, put the wind instrument in his waist, and let out a "wow". The bird was frightened, and Huang Zhu bounced up, throwing the young man out of the pit. The deep pit disappeared, the bamboo rat disappeared, and a beloved bamboo wicker was left to the Dai youth. From then on, the Dai family has a musical instrument like the Bi.