"Christmas is coming, the goose is getting fat..." There is only one day until Christmas which means there is only one mre song until the top selling Christmas song since records began. And that song is the second best selling festive goodie - Boney M's cover of Mary's Boy Child. The million selling German disco group covered the Harry Belafonte classic to deliver the tenth best selling song in the UK ever. The greedy beggars, Rivers Of Babylon got to five and all! But today we're worried about the best selling Xmas songs and tomorrow we will find out what is at number one, pipping Boney M to the post.