Why do you recall the past when you listen to old songs before?

Because of different eras, every era has songs of every era. For example, people liked to listen to revolutionary songs in the sixties and seventies, and gradually accepted pop songs in the eighties. The two northwest winds from the late 1980s to the mid-1990s were the style of the year. So when you hear songs from different eras, the melody of the songs will take you into that era, and what you did in that era will naturally come to mind. Singing a song "Helmsman Sailing at Sea" in the national K song, an uncle heard it and reminded him of the past. He said that when he was young, he waited for the bus and it came. All people waiting for the bus must sing a revolutionary song, otherwise they are not allowed to take the bus.