"Roar" is the first single off Katy Perry's third LP, Prism. Its official release date is Monday, August 12, 2013, although the final version of the song leaked on August 10 and was played on the same day by a number of radio stations across the US. It reached #1 on the US Billboard Hot 100 chart on September 5 and stayed at the top for a total of two weeks, becoming Perry's eighth #1 on the Hot 100. The music video for "Roar" was also released on September 5, 2013, which was directed by Grady Hall and Mark Kudsi. Read more on Last.fm.