Christmas Alphabet by Buddy Kaye is in C at 100 beats per minute and runs 1:50 across 21 bars. It uses 20 chords — Cmaj7, G9, Am7, G7, Dm7, C, Am, D#dim7, 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? Christmas Alphabet guitar melody tab.