Question: What Russian composer and pianist was friends with Canadian composer, pianist, writer on music, and music educator Alfred La Liberté?

<P0-S0>  He was a disciple and close personal friend of Alexander Scriabin. <P0-S1>  He was also an admirer of Marcel Dupré and Nikolai Medtner. <P0-S2> Alfred La Liberté (10 February 1882 – 7 May 1952) was a Canadian composer, pianist, writer on music, and music educator. <P0-S3>  Dupré notably dedicated his "Variations, Opus 22" for piano to him and Medtner dedicated his "Sonata minacciosa, Opus 53 no. 2" and his song "The Captive, Opus 52 no. 7" to La Liberté. <P0-S4>  Most of his own compositions remain unfinished. <P0-S5>  He also contributed articles to "Le Passe-Temps", including one on Scriabin in May 1946. <SEP> <P1-S0> Dominique Ducharme (14 May 1840 - 28 December 1899) was a Canadian pianist, organist, and music educator. <P1-S1>  He studied with Paul Letondal and Charles Wugk Sabatier in Canada before studying for 5 years at the Conservatoire de Paris in France with Antoine Marmontel and François Bazin. <P1-S2>  In Europe he became acquainted with several notable musicians who influenced his piano and organ technique, including Franz Liszt and Camille Saint-Saëns. <P1-S3>  He later befriended Ignacy Jan Paderewski in 1889; a relationship which added to his piano teaching the methodology of the Viennese school. <P1-S4>  He was the organist at the Église du Gesù in Montreal from 1869-1898. <P1-S5>  In 1896-1897 he was the President of the Académie de musique du Québec. <P1-S6>  A celebrated piano teacher, his students included Édouard Clarke, Achille Fortier, Alfred La Liberté, William Reed, Émiliano Renaud, and Joseph Saucier. <SEP> <P2-S0>  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). <P2-S1>  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. <P2-S2>  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. <P2-S3>  He is considered by some to be the main Russian Symbolist composer. <P2-S4> 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. <SEP> <P3-S0> Joseph Rodolphe Mathieu (10 July 1890 – 29 June 1962) was a Canadian composer, pianist, writer on music, and music educator. " <P3-S1> The Canadian Encyclopedia" states, "Considered too avant-garde for his time because of Debussy's influence on his music, Mathieu gained recognition too late to inspire the generation that followed." <P3-S2>  The pianist Léo-Pol Morin was one of the few important exponents of his work, notably including Mathieu's "Chevauchée" and "Trois Préludes" in his concert repertoire. <P3-S3>  Mathieu's song "Un peu d'ombre" (1913) was included in a number of recitals given by Marguerite Bériza and Sarah Fischer in Europe.