Music that I have never heard of will be put into my favorites, and old music will be put into the permanent playlist "Xuan, Ying, Po". Taking the volley command of the Izumo Cavalry in northern Shanxi from "Jiuzhou Piaomiao Lu" in Jiangnan: "Xuan Yi, Ying Yue, Po Jiao", and adding a simple personal understanding: Xuan - the rhythm is relatively gentle or ordinary, Ying - the rhythm It has a strong feeling and breaks the desolation behind enemy lines. It is all pure music.