The rambunctious new musical 'Honeymoon in Vegas' is old-fashioned and proud of it. A big orchestra pumps out a brassy, melodic score that nods to Sinatra's ba-da-bing days...Plus, come on -- Tony Danza's in it! If only parts of the story didn't cross the line between old-school and antediluvian...Director Gary Griffin keeps things moving at a fast clip and often inventively, and the tunes by Jason Robert Brown...have a catchy momentum...Things start dragging when Tommy enters the picture. Danza is game, crooning his way through a couple of Chairman of the Board-style ballads. He even pulls off a decent soft shoe. But his limited range of facial expressions undermines the comedy...the show owes a lot to McClure's tireless efforts. He's spectacularly limber -- watch him uncoil upright from a sitting-down position -- and his open, honest face makes us forgive, or at least overlook, Jack's stupidity. If this 'Honeymoon' hangs on, it'll be in large part thanks to him.