Mad Men's RJD2 opening song has become as iconic as the show's falling-man credits. But it was almost not so! It was almost a different song. A Beck song, says Beck himself. Beck tells Billboard that "[his] instinct has definitely gone awry," like the time he turned down several requests to write a theme song for the show. "It's about ad executives in the '60s? They're going to make a show about that? Really? Um, I don't think so," Beck says he thought at the time. We all make mistakes, Beck; don't be too hard on yourself.