Katy Perry 'Prism': 'Roar' Singer Teams Up With Pepsi To Debut Two Tracks From New Album August 24

Pepsi has taken a hands-on approach to debuting new pop music this year. We got our first taste of "Grown Woman" via Beyonce's "Mirrors" ad and now the soft drink giant has set it's sights on 'Roar' singer, Katy Perry. Fans can tweet to unlock clues about two new songs from Katy Perry's upcoming album Prism, "Dark Horse" and "Walking On Air." Read More »