Opera History and criticism 163 Operas 130 History 127 Music 112 Production and direction 75 Opéra 61 Mais ... Singers 53 Criticism and interpretation 43 Dramaturgy 39 Composers 37 Oper 36 Social aspects 33 Theater 33 Theaters 27 Opéras 26 Philosophy and aesthetics 26 Stage-setting and scenery 26 Ballet 23 Political aspects 23 Libretto 21 Music and literature 20 Performances 20 Women singers 18 Dictionaries 17 Drama 17 Stories, plots, etc 16 Analysis, appreciation 15 Musicians 14 Posters, Polish 14 menos ...