Enough with the Christmas muzak already! Let's have something that's both tuneful and prayerful. Words aren't necessary.
First, here's Mannheim Steamroller with "Fum, Fum, Fum". It's a very old tune from Catalonia in Spain. (Lyrics at the link above.)
Next, an ancient English air, "Greensleeves", the tune of which was adapted in the 19th century to the Christmas carol "What Child Is This?". Lindsey Stirling does the honors.
Here's a hymn from the Orthodox Liturgy of Saint John Chrysostom, which was set to music by Tchaikovsky in 1878. It's not Christmas music, strictly speaking, but it seems to me to fit in very well with the season. It's the "Hymn of the Cherubim". I know this performance is not instrumental, but if you don't speak the language, it might as well be!
And finally, my favorite Christmas hymn/carol, "O Come, O Come, Emmanuel". This instrumental rendition is from The Piano Guys.
Let's never forget the Reason for the season.