If you haven't seen Psy performing his major hit "Gangnam Style," count yourself lucky to finally be in the know. This South Korean pop musician rose to fame after his music video went viral in September with him doing horseback-riding dance moves. Aside from winning the hearts of music fans everywhere, "Gangnam Style" is also the most liked video to ever be viewed on YouTube, with already over 2 million likes. It's also the most viewed video ever. Since its release on July 15, 2012, the clip has been viewed more than 840 million times, surpassing Justin Bieber's "Baby," which has been viewed 806 million times since its Feb. 2010 posting. Which video do you prefer?