"White Christmas" was written by Irving Berlin and recorded by Bing Crosby in 1942. It was a huge hit and has since been covered by many other artists, including Frank Sinatra, Elvis Presley, and Mariah Carey. The song has become a classic holiday tune and is considered one of the best-selling singles of all time. It's often referred to as the "perfect Christmas song" because of its simple yet powerful lyrics and nostalgic melody.