My all-time favorite Andy Williams song is actually a Christmas song, “Oh, Holy Night.” The music is simple, his voice is AMAZING, especially when he hits the high note.
His most famous Christmas song is probably “It’s the Most Wonderful Time of the Year”, which is great too, but he really scores with “Oh, Holy Night.”
That is, indeed, a fine rendition. You can listen to it here
However, I prefer to hear the song in the original French, a celebration of Christ's arrival to save humanity, that is superior to the stodgy English translation. Here are a couple of good recordings of the original version, known as "Minuit, Chrétiens" (Christians, it's midnight) by Richard Verreau and Roberto Alagna.