While "Hallelujah" isn't precisely a traditional Christmas song, it comes close enough and qualifies for our purposes. Especially since it's a hilarious rendition of the Leonard Cohen song as performed by James Corden and, er...well, Kristen Wiig.
Robert J. Elisberg is a political commentator, screenwriter, novelist, tech writer and also some other things that I just tend to keep forgetting.
Elisberg is a two-time recipient of the Lucille Ball Award for comedy screenwriting. He's written for film, TV, the stage, and two best-selling novels, is a regular columnist for the Writers Guild of America and was for the Huffington Post. Among his other writing, he has a long-time column on technology (which he sometimes understands), and co-wrote a book on world travel. As a lyricist, he is a member of ASCAP, and has contributed to numerous publications.