List of operettas and operas by Carl Millöcker  This is a list of the operettas and operas of the Austrian composer Carl Millöcker (1842–1899). Millöcker wrote 20 light operas, of which 16 are described as operettas, one as a Singspiel, one as a 'Volksoper' ('people's opera'). (The other two were left undesignated.) His music is closely associated with the Theater an der Wien in Vienna, where 14 of his works received their first performances.