Christmas Song aka Chesnuts roasting on an open fire
http://www.higherpraise.com/Lyrics4/TheChristmasSong.htm
also go here.. many versions here. and people talk about the chords and the complexity.
http://www.justplainfolks.org/ubb/Forum60/HTML/000040.html
take the time to learn these chords... i can help you with them in many different spots.
this is such a cool jazz version of this song. you will love it.