What song is this backwards?? First right answer gets Best Answer.?

Question

Okay, this is a song that would come on the radio only at a certain time of the year. that is the only clue I'm giving you. And also the person singing it in the clip is not the person who would usually sing it.

Listen to it here:

http://tinypic.com/player.php?v=713arl&s=3

Answer 1

thats freaky but im gonna guess "i wanna wish you a merry x-mas"?

Answer 2

The chipmunks i think(i have a feeling i am wrong)

Answer 3

Felice Navidad

Answer 4

Is global warming reversing songs now?