What is the tune of Hunan Huagu Opera "Zhang Ersao Begging"?

Hunan Huagu Opera "Zhang Ersao Begging for Rice" is called the cross-river tune. According to relevant public information, the spread of the play was passed on by word of mouth through boatmen, citizens and artists in the Yangtze River basin. In Jiangnan area, the drama has been widely performed and has become an important part of local opera culture.