Question: What group of prominent 19th Century composers were Alexander Borodin and Mily Balakirev apart of?

full_context: Document 1: Mikhail Glinka: Mikhail Ivanovich Glinka (Russian: Михаи́л Ива́нович Гли́нка ; 1 June [O.S. 20 May] 1804 15 February [O.S. 3 February] 1857 ) was the first Russian composer to gain wide recognition within his own country, and is often regarded as the fountainhead of Russian classical music. Glinka's compositions were an important influence on future Russian composers, notably the members of The Five, who took Glinka's lead and produced a distinctive Russian style of music.
Document 2: Alexander Scriabin: Alexander Nikolayevich Scriabin ( ; Russian: Алекса́ндр Никола́евич Скря́бин , ] ; 6 January 1872 [O.S. 25 December 1871] – 27 April [O.S. 14 April] 1915 ) was a Russian composer and pianist. Scriabin, who was influenced early in his life by the works of Frédéric Chopin, composed works that are characterised by a highly tonal idiom (these works are associated with his "first stage" of compositional output). Later in his career, independently of Arnold Schoenberg, Scriabin developed a substantially atonal and much more dissonant musical system, which accorded with his personal brand of mysticism. Scriabin was influenced by synesthesia, and associated colours with the various harmonic tones of his atonal scale, while his colour-coded circle of fifths was also influenced by theosophy. He is considered by some to be the main Russian Symbolist composer.
Document 3: Alexander Serov: Alexander Nikolayevich Serov (Russian: Алекса́ндр Никола́евич Серо́в , Saint Petersburg, 23 January [O.S. 11 January] 1820 – Saint Petersburg, 1 February [O.S. 20 January] 1871 ) was a Russian composer and music critic. He is notable as one of the most important music critics in Russia during the 1850s and 1860s and as the most significant Russian composer in the period between Dargomyzhsky's "Rusalka" and the works of Rimsky-Korsakov, Mussorgsky, and Tchaikovsky.
Document 4: Nevsky Pickwickians: The Nevsky Pickwickians was an informal circle of art-loving and intellectual friends who were students at the University of St. Petersburg, Russia at the end of the 19th century. The group originally included Alexandre Benois (effectively its leader), Léon Bakst, Walter Nouvel, Dmitry Filosofov and Konstantin Somov.
Document 5: Sergei Rachmaninoff: Sergei Vasilievich Rachmaninoff (Russian: Серге́й Васи́льевич Рахма́нинов , "Sergey Vasilyevich Rakhmaninov"; ] ; 1 April [O.S. 20 March] 1873 28 March 1943) was a Russian virtuoso pianist, composer, and conductor of the late-Romantic period, some of whose works are among the most popular in the romantic repertoire.
Document 6: Nikolai Rimsky-Korsakov: Nikolai Andreyevich Rimsky-Korsakov (18 March [O.S. 6 March] 1844 21 June [O.S. 8 June] 1908 ) was a Russian composer, and a member of the group of composers known as The Five. He was a master of orchestration. His best-known orchestral compositions—"Capriccio Espagnol", the "Russian Easter Festival Overture", and the symphonic suite "Scheherazade"—are staples of the classical music repertoire, along with suites and excerpts from some of his 15 operas. "Scheherazade" is an example of his frequent use of fairy tale and folk subjects.
Document 7: Modest Mussorgsky: Modest Petrovich Mussorgsky (Russian: Моде́ст Петро́вич Му́соргский ; ] ; 21 March [O.S. 9 March] 1839 – 28 March [O.S. 16 March] 1881 ) was a Russian composer, one of the group known as "The Five". He was an innovator of Russian music in the romantic period. He strove to achieve a uniquely Russian musical identity, often in deliberate defiance of the established conventions of Western music.
Document 8: The Mighty Handful: The Mighty Handful (Russian: Могучая кучка ), also known as The Five and The New Russian School, were five prominent 19th-century Russian composers who worked together to create a distinctly Russian classical music. Mily Balakirev (the leader), César Cui, Modest Mussorgsky, Nikolai Rimsky-Korsakov and Alexander Borodin all lived in Saint Petersburg, and collaborated from 1856 to 1870.
Document 9: Boris Alexandrovich Alexandrov: Boris Alexandrovich Alexandrov (Russian: Борис Александрович Александров , August 4, 1905 Bologoye – June 17, 1994 Moscow) was a Soviet Russian composer, and, from 1946 to 1986, the second head of the Alexandrov Ensemble which was founded by his father, Alexander Vasilyevich Alexandrov. Alexandrov reached the rank of Major-General and was awarded the order of Hero of Socialist Labour, the Lenin Prize and the State Prize of the USSR, and named People's Artist of the USSR. Music by Alexandrov is used for the Anthem of Transnistria.
Document 10: Pyotr Ilyich Tchaikovsky and The Five: 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.
Document 11: Les Six: "Les Six" (] ) is a name given to a group of six French composers who worked in Montparnasse. The name, inspired by Mily Balakirev's "The Five", originates in critic Henri Collet's 1920 article "Les cinq Russes, les six Français et M. Satie " ("", 16 January 1920). Their music is often seen as a reaction against the musical style of Richard Wagner and the impressionist music of Claude Debussy and Maurice Ravel.
Document 12: Alexander Radvilovich: Alexander Yuryevich Radvilovich (Russian: Александр Юрьевич Радвилович ; born 1955) is a Russian composer, pianist and teacher from Leningrad (now Saint Petersburg) from which Conservatory he also graduated at which he was under guidance from Sergei Slonimsky. In 1992 and 1994 respectively he was the first ever composer of Russian origin to get education at the International New Music in Darmstadt. He is known for his symphonies of two of his own poems called "Legend About Violinist" and "Pushkin". At one time, after reading Fyodor Dostoyevsky he composed a string quartet called "The Boy at Christ’s New Year Celebration" and also designed a mini opera called "Let’s Write Fairy-tale". He also composed an opera called "Hindrance" which was based on Danii Kharms' poem "Ruin of the Gods". Currently he is a member of both Russian Composer’s and Saint Petersburg Composer's Unions and works as music pedagogue at the Humanitarian University of the Petersburg Conservatory. On occasion, he tours the world as composer, pianist and leader of the Sound Ways which he also founded back in 1989. His music is published by various labels in countries such as Russia, the Netherlands and the United States.
Document 13: Russian classical music: Russian classical music is a genre of classical music related to Russia's culture, people, or character. The 19th-century romantic period saw the largest development of this genre, with the emergence in particular of The Five, a group of composers associated with Mily Balakirev, and of the more German style of Pyotr Tchaikovsky.
Document 14: Alexander Alyabyev: Alexander Aleksandrovich Alyabyev (Russian: Алекса́ндр Алекса́ндрович Аля́бьев ; 15 August [O.S. 4 August] 1787 6 March [O.S. 22 February] 1851 ), also rendered as Alabiev or Alabieff, was a Russian composer known as one of the fathers of the Russian art song. He wrote seven operas, twenty musical comedies, a symphony, three string quartets, more than 200 songs, and many other pieces.
Document 15: Alexander Borodin: 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.
ground_truth: The Mighty Handful