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).
Iolanta Iolanta, Op. 69, (Russian: Иоланта ) is a lyric opera in one act by Pyotr Tchaikovsky. It was the last opera he composed. The libretto was written by the composer's brother Modest Tchaikovsky, and is based on the Danish play "Kong Renés Datter " ("King René's Daughter") by Henrik Hertz, a romanticised account of the life of Yolande de Bar. In the original Danish play, the spelling of the princess's name was "Iolanthe", later adopted for the otherwise unrelated Gilbert and Sullivan operetta of that name. The play was translated by Fyodor Miller and adapted by Vladimir Zotov. The opera received its premiere on 18 December 1892 in Saint Petersburg.