You know what an earworm is, right? "Stuck song syndrome" occurs when you have a song playing in your head long-after it's been playing on a stereo or however you outside of the clubs, with TV commercials and repetitive radio play causing some tracks to get major play. Others? They just got dropped in a plethora of mixes. We figured it made sense to look at the earworms of 2013... not necessarily tracks that we HATE, but the songs we couldn't escape, be it for the memes that brought them to public consumption or the catchiness of their hooks. Here are the tracks we couldn't stop hearing, even after the record was over... for good or ill.