Opera History and criticism 110 Music 73 History 72 Operas 54 Production and direction 35 Criticism and interpretation 31 more ... Opéra 30 Dramaturgy 26 Singers 24 Social aspects 23 Oper 19 Philosophy and aesthetics 19 Political aspects 18 Composers 17 Libretto 16 Music and literature 12 Performances 12 Ballet 10 Analysis, appreciation 9 Musicians 9 Singing 9 Theater 9 Influence 8 Opera's 8 Appreciation 7 Women singers 7 Librettos 6 Stage-setting and scenery 6 Theaters 6 less ...