In the UK it was Band Aid 20, with a re-release of the original Band Aid song 'Do They Know It's Christmas?', which was no.1 in Christmas 1984. Band Aid 20 was made up entirely of new musical stars rather than the original line-up, except for Bono from U2.
In the USA it was Snoop Dogg featuring Pharrell, with 'Drop It Like It's Hot'.
Huff - 2004 Christmas Is Ruined 1-9 is rated/received certificates of: Argentina:Atp
Growing Up Gotti - 2004 A Very Gotti Christmas 1-11 was released on: USA: 13 December 2004
Animal Icons - 2004 Christmas Animals 1-11 was released on: USA: 9 December 2005
Sunrise Earth - 2004 Christmas Lights 1-51 was released on: USA: 25 December 2007
Only in LA - 2004 Christmas Special 1-12 was released on: USA: 5 January 2005
Dolce Vita - 2004 A Very Rocco Christmas 2-1 was released on: USA: 2013
Do They Know It's Christmas? 1984, 1989 2004.
Quintuplets - 2004 Bob and Carol Save Christmas 1-18 was released on: USA: 15 December 2004 Belgium: 26 November 2007
Eddsworld - 2004 Eddsworld Christmas Special '05 1-9 is rated/received certificates of: USA:TV-Y7
Eddsworld - 2004 Eddsworld Christmas Special '04 1-4 is rated/received certificates of: USA:TV-Y7
Christmas 2004 was on a Saturday.
The Christmas Special Christmas Special - 2004 TV was released on: USA: 14 December 2004