"I Knew You Were Trouble"[note 1] (stylized with a period at the end) is a song by American singer-songwriter Taylor Swift, from her fourth studio album Red (2012). She wrote the song along with the track's producers, Max Martin and Shellback. A dance-pop and pop rock song with a dubstep refrain, "I Knew You Were Trouble" features electric guitars and synthesizers, with lyrics that talk about self-blame after a toxic relationship. The dubstep production divided music critics, who noted it as a radical move from Swift's previous country pop songs.
