Paul's Episcopal Church in San Rafael, California provided the vocals.
https://www.youtube.com/watch?v=YvI_FNrczzQVideo can't be loaded because JavaScript is disabled: Vince Guaraldi Trio – Christmas Time Is Here (Instrumental) (https://www.youtube.com/watch?v=YvI_FNrczzQ)
Meco Monardo — 'R2-D2 We Wish You A Merry Christmas' from Christmas in the Stars[...]