It's a dual statement. On one hand, it's a piece on radio society, and how people can hear the same songs over and over and over 500 times a day and still call up and request it, and how everyone in a relationship has "a song," but it's the same song every other couple picks! Then it's simply a story about recently being dumped by a girlfriend, and "their song" keeps playing wherever he goes, it's all of a sudden ironically inescapable, berating him everywhere while he's still in the mourning period trying to shake her out of his mind.
It's a dual statement. On one hand, it's a piece on radio society, and how people can hear the same songs over and over and over 500 times a day and still call up and request it, and how everyone in a relationship has "a song," but it's the same song every other couple picks! Then it's simply a story about recently being dumped by a girlfriend, and "their song" keeps playing wherever he goes, it's all of a sudden ironically inescapable, berating him everywhere while he's still in the mourning period trying to shake her out of his mind.