The music for the 1954 film 'White Christmas' was written by Irving Berlin. Irving Berlin was an American composer and lyricist who is considered one of the greatest songwriters in American history. He wrote many classic songs, including "God Bless America," "There's No Business Like Show Business," and "Puttin' on the Ritz." The song "White Christmas" is one of his most famous compositions and has become a holiday classic. It was originally written in 1942 for the film "Holiday Inn" and was later reused in the film "White Christmas."