Half of My Heart by John Mayer featuring Taylor Swift is in Bb at 115 beats per minute and runs 3:54 across 65 bars. It uses 7 chords — Bb, F, C, Dm7, Am7, Cm7, Gm7. 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? Half of My Heart guitar melody tab.