Here's some others I've found tonight!
Alvin and the Chipmunks Another TSO Christmas Canon Rock -- This remains the one song that makes me want to get married in a church at Christmas time.
Muppets sing the 12 days of Xmas Charlie Brown Xmas -- As much as it pains me to do this....*sigh*
God Rest Ye Merry Gentlemen -- Not my favorite version of the song....but these people go a bit insane!
Have fun!
And this is just too funny!