Roar! Have you heard Katy Perry's latest song ROAR from her fourth album "Prism" ? The song made its radio debut on August 10, 2013 and was released as a digital download on iTunes Store two days later together with it's lyric video. In just more than a week time,over 544,000 of the track from Prism are sold , breaking Katy's previous "Firework" sales record which was 509,000 copies in a week back in 2010! How amazing is that! Katy Perry will perform her song "Roar" on the upcoming VMA 2013! Stay tuned! :)