Christmas Music And Grammar. Two Of Everyone’s Favourite Things, Together AT Last

I’ll confess. Until I listened to this, I had given exactly no seconds of thought to God Rest Ye Merry Gentlemen’s proper comma placement. In fact I’ve seen it written so many times without one that I wasn’t even sure one was necessary. But I also see a lot of “God Rest Ye Merry, Gentlemen”, so there’s that. But is it right?

And now we know, assuming these guys aren’t wrong.