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Own THE PRISMATIC WORLD TOUR LIVE on DVD and Blu-ray from October 30th, featuring the entire concert plus an additional thirty minutes of behind-the-scenes extras. Also available as a Digital Download. See it in PRISM-Vision, just like the audience saw it live! Order now: http://katyperry.com/PWTL Get “Dark Horse” from 'Prism’: http://smarturl.it/Prism Follow Katy Perry: http://www.katyperry.com http://youtube.com/katyperry http://twitter.com/katyperry http://facebook.com/katyperry http://instagram.com/katyperry Music video by Katy Perry performing Dark Horse. (C) 2015 Perry Productions LLC, exclusively licensed to Eagle Rock Entertainment Ltd. http://vevo.ly/atbxYR