I didn’t know it before, but the Bing Crosby version of the song ‘White Christmas’ is the best-selling single recording in the world (sorry, for some reason the direct link isn’t working):
https://en.wikipedia.org/wiki/White_Christmas_(song)
I don't doubt that one bit. Everybody ends up being away from home at one time or another during Christmas, especially in the military, and this song makes a connection.
I was sitting underground in a missile complex many years ago on Christmas Eve and turned the HF radio to VOA where they played Christmas music all day. This song came on sometime in the wee hours of the morning and made me homesick.