Last Christmas, my son's High School barbershop quartet got the music for this from them and did it. Amazingly well, I might add. It isn't on youtube, but they have it somewhere, it is astounding.
They did some ad libbing too. For example, my son did the dradle portion - and they interrupted him and asked, "aren't you Lutheran - not Jewish - and isn't your dad a pastor?" Then the shaded their eyes and looked out over the audience and one of them said, "I hope he isn't here tonight." Funny stuff.
Peace of the Lord be with you.
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