A weekend at the Vienna Opera will convince you that this house, under the the masterful hand of Frenchman Dominique Meyer, is always in good health.  In mid-April this year, audiences were able to spend three days seeing three facets of what determines the quality of such an institution - while at the same time enjoying one of those moments that make opera legendary! On Friday, Donizetti’s Don Pasquale brought together an almost ideal quartet: tenorissimo Juan...