"Gangnam Style" (, ) is the 18th K-pop single by the South Korean musician Psy. The song was released on July 15, 2012, as the lead single of his sixth studio album Psy 6 (Six Rules), Part 1, and debuted at number one on South Korea's Gaon Chart. On December 21, 2012, "Gangnam Style" became the first YouTube video to reach one billion views. The song's music video has been viewed over 2.51 billion times on YouTube, and has been YouTube's most watched video since November 24, 2012, when it surpassed the music video for "Baby" by Justin Bieber.