BILLBOARD: "Prism era is more impressive than you think"
Are we appreciating Katy enough? That's a strange question to ask in January 2015, when Katy Perry is a massive pop star, one who's once...
Singles from PRISM receive new Gold and Platinum certifications
Katy continues to take records, and new certifications for singles. And the sales figures continue to grow. Federazione Industria...
