Plot: Strauss’s grand Viennese comedy includes soprano Lise Davidsen as the aging Marschallin, opposite mezzo-soprano Isabel Leonard as her lover Octavian and soprano Erin Morley as Sophie, the beautiful younger woman who steals his heart. Bass Günther Groissböck returns as the churlish Baron Ochs, and Markus Brück is Sophie’s wealthy father, Faninal