'Teenage Dream' was the most difficult song I've ever been a part of. We wrote five different versions of it. We couldn't get the lyrics right. Max Martin and Dr. Luke wrote most of the melody, and then Katy Perry and I were responsible for getting the lyrics right.

When I think about 'Since U Been Gone,' I think the first thing that comes to mind is 'Livin' On A Prayer' - they're kind of like sisters, a little bit. And 'Call Me Maybe' was so wildly original, and so quirky, and so satisfying.

For 'Dynamite,' Max and Luke went to dinner and left me with a melody, and then I put it together.

Bonnie McKee Quotes