Question: What is the subtitle of the opera conducted by Nikolai Rimsky-Korsakov at Novaya Opera?
Context: Sadko, Op.  5, is a "musical tableau" by Nikolai Rimsky-Korsakov, written in 1867 and revised in 1869 and 1892.  It is sometimes called the first symphonic poem written in Russia.  It was first performed in 1867 at a concert of the Russian Musical Society (RMS), conducted by Mily Balakirev.  Rimsky-Korsakov later wrote an opera of the same name which quotes freely from the earlier work.  From the tone poem the composer quoted its most memorable passages in the opera, including the opening theme of the swelling sea, and other themes as leitmotives - he himself set out to "utilize for this opera the material of my symphonic poem, and, in any event, to make use of its motives as leading motives for the opera". Valery Kritskov is a Russian conductor who used to take conducting lessons at the Moscow Institute of Culture which were taught by Kirill Tikhonov.  He graduated from there in 1988 and then worked in Moscow-based Helikon Opera till he got employed with Novaya Opera in 2002.  While there, he conducted many operas including Nikolai Rimsky-Korsakov's "The Snow Maiden" and "The Tsar’s Bride" as well as Anton Rubinstein's "The Demon" and Tchaikovsky's "The Maid of Orleans".  He also conducted works by the Italian composers such as Pietro Mascagni's "Cavalleria rusticana" and Ruggero Leoncavallo's "Pagliacci" and German such as Richard Wagner's "Lohengrin" and Strauss' "Die Fledermaus" as well as a concert dedicated to Vincenzo Bellini.  Besides operas, he is also known for his conducting of the Russian ballet based on works by Tchaikovsky and Sergei Prokofiev as well as German and Austrian ballet composers such as Ludwig Minkus and Charles Gounod.  Later on, he became a conductor of the Coppélia ballet which was based by Léo Delibes work and was produced by Imperial Russian Ballet.  Currently he has two CD recordings called "Chorus of the Novaya Opera Theatre of Moscow" and the "Soloists of the Novaya Opera Theatre of Moscow". The Noblewoman Vera Sheloga (Russian: Боярыня Вера Шелога, "Boyarïnya Vera Sheloga" ) is an opera in one act by Nikolai Rimsky-Korsakov.  Rimsky-Korsakov wrote the libretto, which he based on the first act of the play "The Maid of Pskov" by Lev Alexandrovich Mey.  The opera was composed in 1898 from material omitted from the second version of Rimsky-Korsakov's setting of the play as an opera.  The first and third versions of the opera "The Maid of Pskov" omit the first act of the play. The Kolobov Novaya Opera Theatre of Moscow (Russian: Новая Опера ) ("novaya" means "new") is a theatre in Moscow, located at 3 Karetny Ryad.  It was founded in 1991 by Russian conductor Yevgeny Kolobov and then Moscow Mayor Yury Luzhkov.  It is accessible via metro from Pushkinskaya, Tverskaya or Mayakovskaya. May Nights (Russian: Майская ночь, или Утопленница , "Maiskaya noch, ili utoplennitsa " ) is a 1952 Soviet comedy film directed by Aleksandr Rou and starring Nikolai Dosenko, Tatyana Konyukhova and Aleksandr Khvylya.  It is based on Nikolai Gogol's "May Night, or the Drowned Maiden" and the subsequent opera version by Nikolai Rimsky-Korsakov. Christmas Eve (Russian: Ночь перед Рождеством , "Noch' pered Rozhdestvom"), is an opera in four acts with music and libretto by Nikolai Rimsky-Korsakov.  Composed between 1894 and 1895, Rimsky-Korsakov based his opera on a short story, "Christmas Eve", from Nikolai Gogol's "Evenings on a Farm Near Dikanka".  The story had been used as the basis for an opera at least three times previously, including for Tchaikovsky's "Vakula the Smith" (1874).  Oliver Knussen writes that "Rimsky is only interested in recreating the atmosphere of the folk-tale, fleshing it out for his stage pageant in a comparable way to Humperdinck in "Hansel". The Tsar's Bride (Russian: Царская невеста , "Tsarskaya nevesta") is an opera in four acts by Nikolai Rimsky-Korsakov, the composer's tenth opera.  The libretto, by Ilia Tyumenev, is based on the drama of the same name by Lev Mey.  Mey's play was first suggested to the composer as an opera subject in 1868 by Mily Balakirev.  (Alexander Borodin, too, once toyed with the idea.)  However, the opera was not composed until thirty years later, in 1898.  The first performance of the opera took place in 1899 at the Moscow theater of the Private Opera of S.I. Mamontov. Sadko (Russian: Садко ) is a 1952 Russian fantasy film directed by Aleksandr Ptushko.  The film is based on an opera by Nikolai Rimsky-Korsakov, which was based on a Russian "bylina "(epic tale) with the same name, and scored with Rimsky-Korsakov's music from the opera. Maria de Francesca-Cavazza is a German operatic soprano and voice teacher.  Raised in the United States, she is a graduate of the Sherwood Conservatory of Music at the Columbia College Chicago where she was a pupil of Maria Hussa-Greve and Garvin Williamson.  In 1961, she won the Metropolitan Opera National Council Auditions.  Shortly thereafter, she moved to Germany to pursue further studies at the Hochschule für Musik Köln with Margarete Düren.  She made her professional opera debut in 1962 at the Cologne Opera in a minor role, and the following year performed her first leading role with that company as Tsaritsa Militrisa in Nikolai Rimsky-Korsakov's "The Tale of Tsar Saltan".  She then appeared as a leading soprano at several German opera houses, working as a member of the Opernhaus Wuppertal (1964-1965), the Kiel Opera House (1965-1967), the Staatsoper Nürnberg (1967-1976), and the Staatsoper Stuttgart (1976-1986).  As a guest artist, she has made appearances at the Bavarian State Opera, the Bayreuth Festival and the Vienna State Opera, among others.  She can be heard and seen in the role of the Cardillac's daughter in Hindemith's opera Cardillac, conducted by Wolfgang Sawallisch, on a 1985 Munich DVD issued by Deutsche Grammophon.  De Francesca-Cavazza has taught on the music faculties of conservatories in Munich and Nuremberg. 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).
Answer: A Spring Fairy Tale