Events in Music Apr 5 Johann Strauss Jr's opera "Die Fledermaus" premieres in Vienna Birthdays in Music Apr 3 Eduardo Sanchez de Fuentes, Cuban composer, born in Havana, Cuba (d. 1944) Apr 9 Julius Bittner, Austrian composer (Little Violet), born in Vienna, Austria (d. 1939) 1873 Music History by Year 1875