YouTube's top music video for 2013 belonged once again to Korean pop singer PSY but Ylvis' video for the song "The Fox (What Does the Fox Say?)" was the top trending video of the year on the site.
YouTube's top music video for 2013 belonged once again to Korean pop singer PSY but Ylvis' video for the song "The Fox (What Does the Fox Say?)" was the top trending video of the year on the site.
