Who wrote the song I'm are dreaning of a White Christmas?
Bing Crosby is the only one I can think of.
There is no information available that says "White Christmas" was written for a specific instrument. Irving Berlin was assigned to write a song about each of the major holidays for the movie "Holiday Inn". "White Christmas" is the song he wrote as the Christmas song which was used in the movie which was released in August of 1942.