Black Box, GalwayPlaywright Walsh and composer Donnacha Dennehy's exhilarating blend of opera, theatre and film is a study in heartbreak with a hint of Bluebeard's CastlePlaywright Enda Walsh and composer Donnacha Dennehy follow up their first opera, The Last Hotel, with a multi-layered fusion of film, theatre and opera " a collaboration between Landmark Productions and Wide Open Opera, directed by Walsh to thrilling…