“Il Segreto di Susanna” is an operatic gem; and, in addition, stands as the only composition by Ermanno Wolf-Ferrari to boast some kind of posterity, however tepid. An opera intermezzo, it takes up the legacy of Pergolesi’s comic “La Serva Padrona,” but at the same time discourses with near-contemporary one-act pieces from the Giovane Scuola. Its musical facture notably sits {…}