Hark The Herald Angels Sing by Pentatonix is in E at 104 beats per minute and runs 6:01 across 147 bars. It uses 37 chords — E, B, G#m, A, A6, C#m7, A#m7, 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? Hark The Herald Angels Sing guitar melody tab.