MUSIC 92 Genres & Styles 81 Operas 79 Opera 78 Librettos 46 Opéras 46 Criticism and interpretation 32 Music 16 Instruction & Study 12 Philosophy and aesthetics 9 Musique 8 Printed Music 8 History and criticism 7 Classical 6 Philosophie et esthétique 6 General 5 Lyrics 5 Vocal 5 Voice 5 History 4 Musik 4 Reference 4 Histoire 3 Instruction and study 3 Music theory 3 Opera & Classical Scores 3 Songs with continuo 3 Theory 3 Vocal duets with continuo 3 Alphabets & Writing Systems 2