Jean Sibelius, born Johan Julius Christian Sibelius; was a Finnish composer of the late romantic and early modern periods. He is widely regarded as his country's greatest composer, and his music is often credited with having helped Finland develop a stronger national identity when the country was struggling from several attempts at Russification in the late 19th century.

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The core of his oeuvre is his set of seven symphonies, which, like his other major works, are regularly performed and recorded in Finland and countries around the world. His other best-known compositions are Finlandia, the Karelia Suite, Valse Triste, the violin concerto, the choral symphony Kullervo, and The Swan of Tuonela (from the Lemminkäinen Suite). His other works include pieces inspired by nature, Nordic mythology, and the Finnish national epic, the Kalevala; over a hundred songs for voice and piano; incidental music for numerous plays; the one-act opera The Maiden in the Tower; chamber music, piano music, Masonic ritual music, and 21 publications of choral music.

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Sibelius composed prolifically until the mid-1920s, but after completing his Seventh Symphony (1924), the incidental music for The Tempest (1926), and the tone poem Tapiola (1926), he stopped producing major works in his last 30 years—a retirement commonly referred to as the "silence of Järvenpää" (the location of his home). Although he is reputed to have stopped composing, he attempted to continue writing, including abortive efforts on an eighth symphony. In later life, he wrote Masonic music and re-edited some earlier works, while retaining an active but not always favourable interest in new developments in music. Although this 'silence' has often perplexed scholars, in reality, Sibelius was clear: he felt he had written enough.

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Source : Wikipedia

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