Which of the following musical pieces premiered first - Il segreto di Susanna or Die Frau ohne Schatten?
Il segreto di Susanna: Il segreto di Susanna (English: "Susanna's Secret", German: "Susannens Geheimnis") is an intermezzo in one act by Ermanno Wolf-Ferrari to an Italian libretto by Enrico Golisciani. Die Frau ohne Schatten:  When it premiered in Vienna on 10 October 1919, critics and audiences were unenthusiastic.
i don't know