A lack of clear intention is, itself, perhaps a common bio-musical trope too. Even when shaded with a firmer angle, the overriding message behind most of these productions tends to be, simply, that a great musician was great. Squire, to his credit (it’s easy to blame a book writer for everything in a musical; the flaw here seems deeper), does push toward commentary, but what he comes out with are really four books for four different shows. I’d much rather have this thing cut down to size and watch a show just about Louis’s early days in Chicago and the financial predation of the jazz scene, or one just about him in Hollywood dealing with racist producers. Film biopics often fare better when they narrow their focus: Think of Pablo Larraín carving depths from slivers of a life in Jackie or Spencer. Or, take the model of something like Jelly’s Last Jam and go whole-hog with a concept like putting your lead on trial in the afterlife — that recent Encores! production does, unfortunately for A Wonderful World, hang in comparison to this jazz-icon musical. If we all know the melody these shows always follow, it’s long past time for some variations. But in this case, for an open run on Broadway, we get the whole shebang played as straight as possible. Don’t drop your sheet music. Improvisation is not so welcome here.