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Christmas often feels this way as well. The musical canon was was locked in with the childhood of baby boomers.

A lot of Christmas is locked into Victorian England which itself derived from Germany.

I assume you have seen the xkcd illustrating this issue:

Window may be shifting - ASCAP's top 25 for 2018 included:

1. "All I Want For Christmas Is You" (1994) 7. "Last Christmas" (1984) 22. "Christmas Eve/Sarajevo 12/24" (1995)

(OT: 25. "Wonderful Christmastime" (1979) persists as a favored lump of coal for radio/streaming Krampuses everywhere.)