and of course, O Holy Night (by Nsync, no other version is as good) (once, once, I actually heard this in a UK shop, and stood there happily until it was done).
YESSSS i always make like i'm on my phone so i don't look too suspicious, i can't leave until the song is done, happens every year

my fave xmas song is greg lake's i believe in father Christmas and john lennon's war is over. nothing NOTHING is better than nsync's xmas album. it's scarily perfect. not one redundant song.