Ah yes, another case of a #Christmas song that re-purposed an older existing piece of music: "What Child Is This" = "Greensleeves"
Just as "Away In A Manger" = "Flow Gently Sweet Afton" (Robert Burns poem set to music).

In that sentiment, I now present #BobRivers who is the Weird Al of Christmas.
Not "God Rest Ye Merry Gentlemen", but "The Restroom Door Said 'GENTLEMEN'".
#NowPlaying

youtu.be/hl0Ku3UHinc