That’s Christmas To Me by Pentatonix is in Cb at 84 beats per minute and runs 2:59 across 56 bars. It uses 19 chords — Cb, Gb, Db, Ebm, Db6, Gb5, Bbm7, Bbm, 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? That’s Christmas To Me guitar melody tab.