?? Song from Las Vegas Commercial: Carolers

It's on the tip of my brain but I just can't remember...

http://youtu.be/Papfm58APSg


Thank you for any help!

Just a notice.

The same ad video on YouTube was also uploaded with extensive credits including that of "Partner/Composer" to a pair of young men from Beacon Street Music (the music producer for the video). I can't guarantee that this title ensures an original composition vs an arrangement of an existing song (as composers may do). No song is mentioned. The pair seem to enjoy a growing reputation in the industry.

Realistically then, unless they just licensed a previous use that you heard, this song seems to be similar to the one you recall, but not it.

I think it's a cover of another song, with the lyrics changed to fit the Vegas theme. You've given me the best leads I've had so far, thank you!

Miike Snow - Animal was suggested in the comments.