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.
Tritsch-Tratsch-Polka Tritsch-Tratsch-Polka , Op. 214, is a polka written by Johann Strauss II in 1858 after a successful tour of Russia where he performed in the summer concert season at Pavlovsk, Saint Petersburg.