[Radagast the Fool]

“O Holy Night” and “Silent Night”. My grandmother (God rest her soul) used to sing “Silent Night” in German, so that’s my favorite version.
“The Little Drummer Boy” is also a favorite.

If I can include a Santa Claus song, it’d be Elvis’ version of “Here Comes Santa Claus”.

[DeoVindiceSicSemperTyrannis]

Stille Nacht, heilige Nacht,
Alles schläft; einsam wacht
Nur das traute hochheilige Paar.
Holder Knabe im lockigen Haar,
Schlaf in himmlischer Ruh!
Schlaf in himmlischer Ruh!

[BenKenobi]

I used to sing it as a child. Not so much as my voice is not what it was, but it is a beautiful song.

They even sang it in the trenches, that’s how we came to know of it.

[yarddog]

Silent Night really is beautiful in German.