sentences:  Kraus has prepared several English singing translations of operas and operettas in collaboration with lyricist Gregory Opelka.These include Oscar Straus' "The Chocolate Soldier" and "A Waltz Dream"  and Kalman's "The Duchess of Chicago".Other translations include "La Serva Padrona", "Orpheus in the Underworld", "Gianni Schicchi", "Suor Angelica", "The Coronation of Poppea" and "The Land of Smiles".