title: Alienation as expressed in three twentieth-century operas.
mesh_terms: D004324:Drama; D004532:Ego; D005619:Freudian Theory; D006801:Humans; D007398:Interpersonal Relations; D008091:Literature; D009146:Music; D011037:Poetry as Topic; D011573:Psychoanalytic Interpretation; D012918:Social Alienation; D013561:Symbolism