Link: Katy Perry's 'PRISM': The Billboard Cover Story : http://www.billboard.com/articles/columns/pop-shop/5740580/katy-perrys-prism-the-billboard-cover-story
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Katy Perry (Musical Artist)Billboard (Magazine)katy perryJoni MitchellKaty Perry BillboardKaty Perry Billboard CoverKaty Perry Joni MitchellKaty Perry PrismKaty Perry RoarEntertainment Newsmusic newsentertainmentNewsMusickaty perry songskaty perry news