I Knew You Were Trouble by Taylor Swift is in G at 150 beats per minute and runs 3:06 across 67 bars. It uses 5 chords — G, D, Em, C, N.C.. The chord diagram changes as the song plays and the words light up as they are sung, so you can strum and sing along without reading ahead.
Want the melody line note by note? I Knew You Were Trouble guitar melody tab.