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
Christmas music do tend to develop an association with Christmas or the holiday season, such an association tends to be much shorter lived than the more traditionally themed Christmas songs such as "I Wish It Could Be Christmas Everyday", "Mistletoe and Wine" and "Merry Christmas Everyone", and the songs may have nothing to do with Christmas or even winter. Some notable and longer-lasting examples include Band Aid's "Do They Know It's Christmas?" (No. 1, 1984, the second biggest selling single in UK Chart history; two re-recordings also hit No. 1 in 1989 and 2004), Slade's "Merry Xmas Everybody" (No. 1, 1973) and