Which had more acts/ scenes, The Snow Maiden or Sadko?
The Snow Maiden The Snow Maiden (subtitle: A Spring Fairy Tale) (Russian: Снегурочка–Весенняя сказка , "Snegúrochka–Vesennyaya Skazka") is an opera in four acts with a prologue by Nikolai Rimsky-Korsakov, composed during 1880–1881. The Russian libretto, by the composer, is based on the like-named play by Alexander Ostrovsky (which had premiered in 1873 with incidental music by Tchaikovsky).
Lady Macbeth of the Mtsensk District (opera) Lady Macbeth of the Mtsensk District (Russian: "Леди Макбет Мценского уезда" , or "Ledi Makbet Mtsenskogo uyezda") is an opera in four acts and nine scenes by Dmitri Shostakovich, his Opus 29. The libretto, jointly written by Alexander Preys and the composer, is based on the novel of the same name by Nikolai Leskov. (The opera is incorrectly named "Lady Macbeth of Mtsensk" on several commercial CD and DVD recordings.)