Opera History 18 Criticism and interpretation 16 Music 11 History and criticism 10 Influence 7 Theater 6 more ... Singers 4 Social aspects 4 Analysis, appreciation 3 Commedia dell'arte 3 Composers 3 Composition (Music) 3 Instruction and study 3 Librettos 3 Music theory 3 Mythology, Classical, in opera 3 Operas 3 Production and direction 3 Singing 3 Women in opera 3 Appreciation 2 Experimental theater 2 Heroines in opera 2 Impresarios 2 Influence (Literary, artistic, etc.) 2 Italian drama 2 Italian drama (Comedy) 2 Italian influences 2 Libretto 2 less ...