Janáček, Leoš (lĕˈôsh yäˈnächĕk) [key], 1854–1928, Czech composer, theorist, and collector of Slavic folk music. He studied in Prague and Leipzig and founded a music conservatory at Brno in 1881. His works include the operas Jenufa (1904), his best-known work; Katia Kabanova (1921), after Ostrovsky's Storm; The Makropulos Affair (1926); and From the House of the Dead (1930), after a novel by Dostoyevsky. Also of note are Janáček's song cycle, The Diary of One Who Vanished (1916–19), and his Glagolitic Festival Mass (1926), with a text in Old Slavonic.
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