Opera MUSIC 589 Genres & Styles 492 Operas 241 Printed Music 198 Criticism and interpretation 154 Opéras 151 Instruction & Study 134 Voice 132 Lyrics 128 Vocal 128 History 114 Librettos 105 Opéra 100 Music 85 Oper 83 Opera & Classical Scores 66 History and criticism 65 Histoire 61 Musique 61 General 55 MUSIC / Genres & Styles / Opera 44 Philosophy and aesthetics 44 Analysis, appreciation 41 Histoire et critique 41 Production and direction 38 Theater 36 BIOGRAPHY & AUTOBIOGRAPHY 34 Social aspects 33 Analyse et appréciation 32