It is said that Bai Zhantang can play the flute. What's that song?

That song is called Gusuxing, which is a famous Jiangnan flute. According to legend, there is a joke in the Wulin rumor that it is played by a big flute from the south, and its timbre is melodious and soothing. Gusuxing is a representative play. I listened to it again. It should be Gusuhang. It's more like a dresser Qiu Si, but it's too short. It's almost the same as any one. In addition, the South-to-North Tune can be changed at will by blowing, which is very flexible.