Because I am the son of a WW2 vet, I am a sucker for WW2 era songs like White Christmas and the epically sad Have Yourself A Merry Little Christmas because of their stories. Growing up a huge Presbyterian church, I also love Organ and Choir songs. St Martin in the Fields, Mormon Tabernacle, Prague Philharmonic, Choir of Kings College, etc.
One of the great mysteries of Christmas is how Unitarians have played such a big role in it, including writing many of the best carols:
https://uufw.org/the-unitarian-heritage-of-christmas/