Imagine this scene in a movie: the main character has just experienced a terrible loss or event. They feel like they have nothing left to live for; they feel numb. As they are sitting on the train to get back home, they’re listening to music and leaning against something beside them, maybe a window or a sheet of glass. You can still hear the noises in the background, but they’re fuzzy. The camera focuses on the main character. The music that has previously only been in the background grows drowns out everything else as a tear slips down their face.
This is the song that is playing.
Or maybe this one.