• Max Martin, a Swedish producer and songwriter, is the mastermind behind numerous mega-hit pop songs. • He's won five Grammys for songs including "Since U Been Gone" and "Can't Stop The Feeling." • Taylor Swift worked with Martin on her new album, "The Life of a Showgirl."

Max Martin was once a mysterious force behind the world's biggest pop music hits.

Martin, whose real name is Karl Martin Sandberg, has been writing and producing songs since the '90s, but music fans now recognize his name as a standard part of the pop zeitgeist.

Some of his biggest hits almost wound up in the hands of other stars — TLC was offered "...Baby One More Time" before Britney Spears. But no matter which pop artist ends up taking on the track, Martin's work has a huge success rate, with a total of five G

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