Norah Jones and Stephen Colbert Do Worst Christmas Song Ever

(Radio.com) "Sim-ply, ha-ving, a wonderful Christmastime!" You know the tune. So do Norah Jones and Stephen Colbert, who came to the Paul McCartney song's defense Monday night after several media outlets called it the "worst ever."

"It's my understanding that McCartney's "Wonderful Christmastime" cannot be played to prisoners of war under the Geneva Convention," wrote a Twitter user Colbert quoted in his intro.

No, there's something much worse than "Wonderful Christmastime." It's called "Christmas Is Now," and Jones performed it with Colbert last night. Get ready for the most grating, schlocky holiday tune you've ever heard. It will make you beg to hear McCartney's iconic 1979 gem. And that's just the point. If Colbert can take the prize for the worst Christmas song of all time, well, then McCartney might be off the hook � which won't stop Paul's song from playing over and over every holiday season. Watch it here.