Katy Perry’s Prism hasn’t exactly lived up to the performance of its predecessor, Teenage Dream, but that isn’t really a fair comparison given the historic chart results of the latter.

‘Roar’ and ‘Dark Horse’ have certainly been juggernauts, but does anybody think ‘Birthday’ is destined for greatness?

And ‘Walking On Air,’ another single and today’s random SOTD, fell pretty flat.

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