I love the music of Vince Guaraldi, and the Christmas season always makes people aware of him. He was the jazz pianist and composer who wrote and performed the musical scores for the "Charlie Brown" cartoon series, including "A Charlie Brown Christmas," which is played every Christmas season on television. It first appeared for Christmas in 1965. My favorite Guaraldi Christmas tune is "O Tannebaum," which is German for "O Christmas Tree," if I am not mistaken. Guaraldi's mellow jazz interpretation of this song is fantastic, and I particularly love it when the string bass and drums start several measures into the song.
Here it is: enjoy!