La Divina, as fans called the late Maria Callas, is back on the road in the ectoplasmic form of a singing hologram. Everything about the show—orchestra, conductor, tickets takers, ushers—is live, just not the talent you’re there to see. We’re prepared to believe that the show is uncanny, as many have said. See and hear for yourself. The tour has two stops in North American (Chicago on September 7, Toledo on September 10), and then travels through Europe from November 7 to December 1. —M.G.