Later this week, the where-were-you-when-you-first-heard crowd will be putting on a full court press for the 50th anniversary of the assassination of John F Kennedy. As the years go by I grow less and less interested in grassy knolls and all the rest, but I am struck by one genuine, non-conspiracy-theorist feature of the event: It's the only assassination with a musical score. Garfield doesn't have one, nor does Lincoln, although he was shot at a theatre. I twice had the misfortune of sitting through tryouts for something called JFK The Musical. Aside from any other problems, the concept suffered...