What is i knew you were trouble chords?

"I Knew You Were Trouble" is a song by Taylor Swift that was released in 2012. The song features a predominantly electric guitar-driven sound with a pop-influenced chorus and dubstep-infused breakdown. The song is written in the key of B minor and features a four-chord progression through most of the song, which consists of Bm, G, D and A chords. The song is widely popular and has been covered by numerous artists.