南北朝乐府诗《折杨柳歌辞》,其一云:上马不捉鞭,反折杨柳枝。蹀(dié)座吹长笛,愁杀行客儿。诗中这位行客为什么不拿马鞭,反而折下杨柳枝来,下马后坐在那里吹笛子(古人把嫩柳枝掐断,抽掉茎中的木质干,留下茎皮,在一端略加修整即可吹响,犹如笛声,也叫柳笛、柳哨)?而且“愁杀” The Northern and Southern Dynasties’ Yuefu poem “Fold off the Willow Songs” has a cloud: It does not take the whip and it will revert to Yang Liuzhi. The dié played the flute and strangled the visitor. In the poem, why did the guest not take the whip, but instead he took off the willow branch and sat down there and played the flute. (The ancients cut off the tender willow branch and removed the dried wood stems from the stem, leaving the stem bark slightly on one end. You can blow it up like a flute, but also a shawl and a willow whistle.