Trainwreck by Demi Lovato is in Cm at 160 beats per minute and runs 2:59 across 97 bars. It uses 14 chords — Gm, Gb+, Bb, Em7, Cm7, Eb, Dm7, F, and a few more. 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? Trainwreck guitar melody tab.