Several guesses so far, but no one's gotten it right.
How about a hint?
Musicians that have recorded this particular song include The Captain and Tennille, The Beach Boys, The Drifters and my favorite version that was done by the Muppets.
Seriously now, that's a total giveaway, even if you don't have access to my iPod's holiday music playlist................
Answer later tonight - somebody's gotta guess the Tails!