Go check out Bethany and Joe, they have three albums out now (all short) of fantastic bluegrass versions of Christmas songs (mostly carols)
There, there’s links to all of it. The instrumentation is all top notch, go have a listen it’s well worth it. The fiddling is great.
Also the Purple Hulls have a fairly new Christmas album that’s really good
This got erased last time I posted, so I’m reposting