Bing Crosby will always be Mr Christmas as far as I'm concerned. Also Harry Belafonte Christmas songs.
Dad had a cassette full of instrumental Christmas music by The Living Strings and Bert Kaempfert, which is also dear to my heart. I'm sure the cassette has long ago turned into mush, and the vinyl records it was recorded from are long gone, but I managed to put some of it onto CD. I looked for Living Strings on Youtube and couldn't find the versions I liked. They all seem to be later versions that added a choir-- "Living Strings And Living Voices"-- that just aren't the same.
-k