Right now, it’s still a mystery as to who will appear on tonight’s final “The Late Show With David Letterman” that airs May 20. CBS has not issued any announcements at press time, though that, of course, could change at any moment. The big question for fans of the Fab Four, of course, is whether a member of the Beatles could be one of the guests. And in reality, that door does appears to be open at least a little.

The 50th anniversary retro marquee unveiled by CBS at the Ed Sullivan Theater where David Letterman's show is taped.

Keith Putney – used by permission.

A Paul McCartney spokesman would only say “no word” when contacted by Beatles Examiner today and asked if McCartney would be appearing. There’s also been no comment when asked about a Ringo appearance from his spokesman. In other words, no one is saying they won’t (or they will, for that matter). Bob Dylan and Bill Murray were among the guests on the show Tuesday night with Murray jumping out of a giant cake and Dylan performing “The Night We Called It a Day.”

Both Paul and Ringo have made several appearances on the show. Ringo Starr’s announced his first All-Starr Band tour in a 1989 appearance. Paul McCartney most’s memorable appearance was in http://www.examiner.com/article/why-a-beatle-just-might-be-on-the-final-david-letterman-show