The Manhattan School of Music Opera Theater will showcase four performances of Johann Strauss’ “Der Zigeunerbaron.” The operetta, which is the second most famous work by Strauss, will be conducted by Kynan Johns, directed by Linda Brovsky and sung in German. The work, which premiered in Vienna in October 1885, features an Ignaz Schnitzer libretto based on “Sáffi,” a novella by Hungarian writer {…}