It is a kind of women singing and dancing wearing men clothes from the end of Heian period to the Kamakura period. (There were few men, too.

Basically, the woman who do Shirabyoshi are high grade prostitutes (Japanese Hetaera) who are permitted to enter to aristocrats’ mansion. The famous Shizukagozen who became a mistress of the power holder was became a prostitute when she was 14 years old. When there was a chance to do Shirabyoshi in front of the power holder, she improvised a modern song and danced. That attracted the power holder and she lived well. Under the protection of the power holder, it is promised a good life.

… … anyway, she was talented.