Max MartinSure, it was Katy Perry who kissed a girl and Britney Spears who sang "Livin' in sin is the new thing," but the words are actually those of Max Martin, a 38-year-old Swedish producer that some would argue is the biggest pop songwriter in the world.

"He was the guy who ushered in teen pop being more like a form of creative expression," Ann Powers, pop music critic for the L.A. Times tells PopEater. "Look at [producers] Stargate, Ryan Tedder -- they wouldn't exist without Max or the success he had. There's been a huge shift in the 21st century towards appreciating mainstream pop and I would base that as a shift to when Max Martin started."