(I call them albums to confuse the kids.

Surprisingly they are both from Country Music artists but there's nothing about any of the songs that they sing that could be labels "country".
It's just great vocals and Christmas melody.
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Vince Gill "Let there be peace on Earth"
It's just soft and sweet music and his voice perfectly matches the tone of the songs.
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Martina McBride "White Christmas"
I can't recommend this one enough.
Her voice is just beautiful strong and clear and there's very little instrumentation to get in the way of it.
The best part of her singing is that it's classic.
By that I mean she makes no variation on the song.
And......the best part.......she can......HOLD A NOTE!
None of that horrible Mariah Carey vocal fluctuation at the end that is sadly too common in vocals today.