Jānis Liepiņš was a conductor for which opretta composed by Johann Strauss II?
Die Fledermaus Die Fledermaus (] , "The Bat", sometimes called "The Revenge of the Bat") is an operetta composed by Johann Strauss II to a German libretto by and Richard Genée.
Schlagobers Schlagobers ("Whipped Cream"), Op. 70, is a ballet in two acts with a libretto and score by Richard Strauss. Composed in 1921–22, it was given its première at the Vienna State Opera on 9 May 1924.