The next-to-last Tonight Show with Johnny Carson, not the finale, is the one most people remember – the one where he was serenaded by Bette Midler. Well, tonight is the penultimate episode of Late Show with David Letterman, and there’s also a musical guest on board for the occasion: Bob Dylan. Somehow, though, I’m not expecting an original-lyrics tribute from Bob. But regardless, it’s Dylan’s first appearance on the show since 1993, Letterman’s first year on CBS. And also featured on this highly valued hour of TV real estate: Bill Murray, who was Letterman’s very first Late Night guest on NBC, way, way back in 1982.