I had never heard this song until yesterday and I thought I knew all the sad Christmas songs ever written. It's kind of swingy and upbeat for a song that's all about loneliness.
Music by David Holt, lyrics by the incomparable Sammy Cahn. Vocal by the coolest member of the Rat Pack (IMO). I think he had a few too many cocktails before coming onstage.
If the video doesn't play in the window below you can watch it here.