Cover songs can often make for a fresh listening experience, breathing new life into old favorites or offering a different take that gives you newfound appreciation or unearths layered meaning. But they can also be dangerous territory for the original artists — like, for instance, when a cover becomes so popular it eclipses the first track, and the world starts to forget where the song came from (if they'd even heard it before at all).

You might think you know whose song is whose, but it's more common than you think: Madonna, Beyoncé, and even the Beatles have become known for tracks that aren't actually their own. Below, click through 14 famous songs you may not have known were covers.