Irving Berlin wrote "White Christmas" for the 1942 musical film, "Holiday Inn" and it was actually done as a duet with Bing Crosby and actress Marjorie Reynolds (although her voice was dubbed by singer, Martha Mears). Bing recorded a solo version and it topped the charts that year.
Later, the song would appear again in another musical, appropriately titled, "White Christmas" in 1954 which also starred Bing Crosby.
This is another song that has been recorded by many, many people but Mr. Crosby's version is the only one in the Guiness Book of World Records as the Best Selling Single Of All Time with 50 million copies being sold.
"White Christmas" - Bing Crosby (1942)