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Taylor Swift goes full 'pop' on "I Knew You Were Trouble", the third promotional track from the iTunes Countdown campaign prior the worldwide release of her fourth studio album "Red", in stores October 22 via Big Machine Records! Produced by Max Martin and Shellback, "Trouble" is a catchy pop/rock tune where Tay-Tay sings of that frustration of knowing that boy would break your heart before getting together. "Trouble" features some cool dubstep-ish breaks too. It's a modern Taylor!