I'd been wary of the Bob Dylan Christmas album, but I've gotta admit, I get a kick out of this video. (Thanks, Stuart and Al)
And yes, Dylan admits he got the arrangement from Brave Combo, who's been doing this song for years. (from an interview with Street News Service)
BF: MUST BE SANTA is a real jumping polka. Did you hear a lot of polka bands growing up?Come to think of this, I played the Brave Combo version on last year's Big Enchilada Christmas Podcast.
BD: Yeah, I heard a few.
BF: I never heard that song before. Where did you hear it?
BD: I first heard that song years ago on one of those “Sing Along with Mitch” records. But this version comes from a band called Brave Combo. Somebody sent their record to us for our radio show. They’re a regional band out of Texas that takes regular songs and changes the way you think about them. You oughta hear their version of Hey Jude.