I Knew You Were Trouble

"I Knew You Were Trouble" is a song in the key of F# minor. It was released by Taylor Swift as a single from her fourth studio album, "Red," in 2012. The song was written by Taylor Swift, Max Martin, and Shellback. As an interesting trivia, the inspiration behind the track came from Swift's personal experiences and past relationships. "I Knew You Were Trouble" features a catchy and dynamic melody, characterized by a blend of pop and country elements that is distinctively Taylor Swift.