The melody of Hark The Herald Angels Sing by Pentatonix runs 414 notes across 147 bars, 6:01 long in E at 104 beats per minute. The tab sits almost entirely in the first two frets, one note at a time — no chords to barre and no strumming pattern to keep up with. A piano backing track plays the chords and bass underneath, so the line you are learning sounds like the record even at half speed.
Prefer to strum and sing it instead? Hark The Herald Angels Sing chords and lyrics.