American Christmas Songs

       This past week, I was listening to "White Christmas" on the radio while thinking of an Australian I got the chance to meet, and something occured to me; In Australia, Christmas is in the middle of the summer. They're not going to be singing of white christmases "like they used to know" because, well, unless they lived in the northern hemisphere or traveled, they've never had white christmases. Then it occured to me that there must be christmas songs with American origins, and that every country with a christian population probably has it's own christmas songs.
       It turns out that "White Christmas" was written by Irving Berlin in the 1940's. Similarly, "The Christmas song" (Chestnuts roasting on an open fire) was written in 1944 by Mel Torme and Bob Wells. Alledgedly, "White Christmas" was written in Arizona and "The Christmas Song" was written during a hot summer somewhere else in America.
      The question i'd like to ask you all is, Do you think that these American Christmas songs actually represent our christmas experiences, or do they represent the christmases we wish we had?
      "White Christmas" mentions writing christmas cards wishing others to have happy holidays, which I do, and althought I don't roast chestnuts, I remember eagerly waiting for Santa like in  "the Christmas song." How do you feel about it? Do any christmas songs you like actually relate to your experiences or not?
     Finally, Why do you think people write christmas songs? If you wrote a christmas song, what would it be about?