Tchaikovsky
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Iulii Konius

Iulii Eduardovich Konius (Юлий Эдуардович Конюс), also known in the west as Jules Konyus or Julius Conus, was a Russian violinist, composer and teacher, born on 19 January/1 February 1869 in Moscow, the second son of the piano teacher and music teacher Eduard Konstantinovich Konius (1827–1902), and brother to Georgii Konius and Lev Konius.

Konius studied composition under Sergei Taneev at the Moscow Conservatory, graduating in 1888. He then studied in Paris, where he played the violin in Edouard Colonne's orchestra. From 1893 until 1901 he taught violin classes at the Moscow Conservatory, and he also advised Tchaikovsky on matters of violin technique in his Symphony No. 6 (1893), while his brother Lev assisted Tchaikovsky with the piano arrangement of the symphony.

Following the revolution, Konius left Russia for Paris in 1919, where he taught at the city's Russian Conservatory, but returned to his homeland in 1939.

Iulii Konius died at Melenkii (Vladimir region), Russia, on 3 January 1942, aged 72.