High Note - Glee's "A Very Glee Christmas" Ep: Baby, It's Cold Outside

Usually I find Christmas songs very irritating and this episode was full of it, but the above song (that I've even found certain versions to be creepy) was untraditionally sung by two males and came off as sweet and endearing.  Plus it doesn't hurt that I love Kurt and am crushing on Blaine.

High Note runnerup:  Last Christmas
because it's one of the few Christmas songs that I don't mind hearing constantly.