The Promise by The Martins is in Eb at 85 beats per minute and runs 4:48 across 47 bars. It uses 9 chords — Bb5, Bb, Eb, Cm7, Fsus, F, Ebmaj9, Gm, 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? The Promise guitar melody tab.