I Saw Mommy Kissing Santa Claus by Andy Williams is in C at 136 beats per minute and runs 3:14 across 46 bars. It uses 60 chords — C, Am7, F#m7, Fmaj7, Em7, A9, Dm7, Fm7, 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? I Saw Mommy Kissing Santa Claus guitar melody tab.