Sister Xiao, Buyi and Miao people play musical instruments. The Bouyei language is called Uli Ulu. In Miao language, it is called Zhandaxi, Libu, and Mimi. Chinese called sister Xiao. There is such a legend about the origin of the sister Xiao.

According to legend, in the north bank of Nanpan River in Guizhou, there lived a Bouyei family in ancient times. There were seven smart and pretty girls in their family. They loved weaving and embroidery since childhood. One autumn, the seven sisters were spinning and weaving in the bamboo upstairs. The seven Hsinchu bamboo poles hanging on the upstairs gave off bursts of fragrance, attracting swarms of bees every day. One day, a small hole was stung on a bamboo pole by a wasp, and for seven days, a small hole was stung on every water bamboo that was hanging yarn. The seven sisters were in annoyance when an autumn wind suddenly blew, and the seven water bamboos made a melodious "Uli Ulu" music. The next day, the seven sisters went up the mountain to chop a piece of water bamboo. The eldest sister followed the wasp's example and drilled a small hole in the bamboo tube with a spindle. The six sisters also drilled a hole each to make a seven-hole flute. Use it to blow out beautiful music and bring joy to the Buyi people. Later, people called the musical instruments made by the seven sisters as Uli Ulu, which have been passed down from generation to generation and have been handed down to this day.