That's what we call "last song syndrome". I get that all the time when I really like the song that I listened to. It simply makes me happy knowing that I am not the only person who experience this. When a song is really good, we tend to play it over and over again until it gets stuck in our minds. There must be something about the lyrics and melody that make the song special; one of the reasons why we fall in live with it. By the way, I am hoping that I will get the chance to learn some more from you.