White Christmas (weather) by Bing Crosby from the film "Holiday Inn", is the best-selling single of all time and speaks nostalgically of a traditional white Christmas. The definition of "white Christmas" varies. In most countries, it simply means that the ground is covered by snow at Christmas, but some countries have more strict definitions. In the United States, the official definition of a white Christmas is that there has to be a snow depth of at least at 7:00 a.m. local time on Christmas morning, and in Canada the official definition is that there has to be more than on the ground on
George Michael calling the move "way overdue". In November 1984, Michael joined other British and Irish pop stars of the era to form Band Aid, singing on the charity song "Do They Know It's Christmas?" for famine relief in Ethiopia. This single became the UK Christmas number one in December 1984, holding Michael's own song, "Last Christmas" by Wham!, at No. 2; Michael also donated the royalties for "Last Christmas" to Ethiopia. "Do They Know It's Christmas?" sold 3.75 million copies in the UK and became the biggest selling single in UK chart history, a title it held until 1997 when it