Question: The composer Alexander Borodin, who wrote the opera Prince Igor, was a part of which group dedicated to producing a uniquely Russian kind of classical music? 
Context: Fire Maidens from Outer Space (1956), released in the United States as Fire Maidens of Outer Space, is an 80-minute black-and-white science fiction feature film.  It was a British production, written, produced and directed by American filmmaker Cy Roth as a collaboration between Cy Roth Productions and Criterion Films, and distributed in the UK by Eros Films and in the USA by Topaz Film Co..  The film stars Anthony Dexter as the lead astronaut, Susan Shaw as a "fire maiden" who befriends him, Paul Carpenter as the expedition captain, and Jacqueline Curtis as the "fire maiden" leader.  There were 13 additional "fire maidens".  The music score features cues excerpted from the opera "Prince Igor" by Alexander Borodin. In mid- to late-19th-century Russia, Pyotr Ilyich Tchaikovsky and a group of composers known as The Five had differing opinions as to whether should be composed following Western or native practices.  Tchaikovsky wanted to write professional compositions of such quality that they would stand up to Western scrutiny and thus transcend national barriers, yet remain distinctively Russian in melody, rhythm and other compositional characteristics.  The Five, made up of composers Mily Balakirev, Alexander Borodin, César Cui, Modest Mussorgsky, and Nikolai Rimsky-Korsakov, sought to produce a specifically Russian kind of art music, rather than one that imitated older European music or relied on European-style conservatory training.  While Tchaikovsky himself used folk songs in some of his works, for the most part he tried to follow Western practices of composition, especially in terms of tonality and tonal progression.  Also, unlike Tchaikovsky, none of The Five were academically trained in composition; in fact, their leader, Balakirev, considered academicism a threat to musical imagination.  Along with critic Vladimir Stasov, who supported The Five, Balakirev attacked relentlessly both the Saint Petersburg Conservatory, from which Tchaikovsky had graduated, and its founder Anton Rubinstein, orally and in print. "Prince Igor" is a song inspired by the Polovtsian Dances of Borodin's opera "Prince Igor".  The main vocals are performed by Warren G, the Russian refrain by Sissel Kyrkjebø and the instrumental background is provided by The Rapsody.  Warren G uses the same rap lyrics as in his song "Reality", available on the album "Take a Look Over Your Shoulder". "Stranger in Paradise" is a popular song from the musical "Kismet" (1953), and is credited to Robert Wright and George Forrest.  Like almost all the music in that show, the melody was taken from music composed by Alexander Borodin (1833–1887), in this case, the "Gliding Dance of the Maidens", from the "Polovtsian Dances" in the opera "Prince Igor" (1890).  The song in the musical is a lovers' duet and describes the transcendent feelings that love brings to their surroundings.  Later versions were mostly edited to be sung by male solo artists. The Polovtsian Dances, or Polovetsian Dances (Russian: Половецкие пляски, "Polovetskie plyaski" from the Russian "Polovtsy"—the name given to the Kipchaks and Cumans by the Rus' people) form an exotic scene at the end of Act II of Alexander Borodin's opera "Prince Igor". Steven Charles Pimlott {'1': ", '2': ", '3': ", '4': "} (18 April 1953 – 14 February 2007) was an English opera and theatre director, whose obituary in "The Times" hailed him as "one of the most versatile and inventive theatre directors of his generation".  His output ran the gamut of the theatrical and operatic repertoire, from musicals, such as "Joseph and the Amazing Technicolour Dreamcoat", and popular plays, such as Agatha Christie's "And Then There Were None", through classics such as Shakespeare and Molière, to Stephen Sondheim and James Lapine's "Sunday in the Park with George" and Alexander Borodin's "Prince Igor. Alexander Borodin's Scherzo in A-flat major is a lively piece written in 1885, while Borodin was in Belgium for an early performance of his then incomplete opera "Prince Igor".  It was originally written for solo piano but in 1889 Alexander Glazunov orchestrated it, along with the "Petite Suite".  Borodin dedicated the piece to Théodore Jadoul, who made a four-hand piano arrangement of it. Prince Igor (Russian: Князь Игорь , "Knyaz' Igor'") is an opera in four acts with a prologue, written and composed by Alexander Borodin.  The composer adapted the libretto from the Ancient Russian epic "The Lay of Igor's Host", which recounts the campaign of Rus' prince Igor Svyatoslavich against the invading Cuman ("Polovtsian") tribes in 1185.  He also incorporated material drawn from two medieval Kievan chronicles.  The opera was left unfinished upon the composer's death in 1887 and was edited and completed by Nikolai Rimsky-Korsakov and Alexander Glazunov.  It was first performed in St. Petersburg, Russia, in 1890. Alexander Porfiryevich Borodin (Russian: Алекса́ндр Порфи́рьевич Бороди́н ; ] , 12 November 183327 February 1887) was a Russian Romantic composer of Georgian origin, as well as a doctor and chemist.  He was one of the prominent 19th century composers known as The Mighty Handful, a group dedicated to producing a uniquely Russian kind of classical music, rather than imitating earlier Western European models. Symphony No. 2 in B minor by Alexander Borodin was composed intermittently between 1869 and 1876.  It consists of four movements and is considered the most important large-scale work completed by the composer himself.  It has many melodic resemblances to both "Prince Igor" and "Mlada", two theatre works that diverted Borodin's attention on and off during the six years of composition.
Answer: The Mighty Handful