Well... If you mean "die" as in death, they are no longer alive, breathing. Then no, they did not die. However, I assume you mean "die" as in fade out, or no longer listened to as much. Yes, their only big hit song was "Gangnam Style". It was a huge thing around the globe. Yet, in an entire different language, America still considers it one of the top 5 songs of the year. But it gets "old" fast and yes, it has faded out quickly.