12 Greatest Carols                        

It started out as a way to record a few Christmas Carols in Beatles' style, and ended up being a years-long project that landed on the soundtracks of both "Scrubs" and "Christmas With the Kranks." 

You can download a copy at Amazon, stream it at Spotify and Apple and a few other places, too.  Not sure whether the Zune store is still open, but it was available there way back when.