What film and television songs are consistent with their own film and television works and become classics?

The theme song of "In a hurry that year" became a classic, and the content he expressed was consistent with the content of film and television works, and both expressed a regret in youth. Youth is short, fleeting, and the people we meet in youth will make us unforgettable all our lives. We went through a lot of ups and downs with these people, but in the end we left in a hurry, and many things were too late to be put down and explained, so we missed it alive and hurried that year.