What Russian composer contributed to the violin concerto?
Pyotr Ilyich Tchaikovsky
Title: Pyotr Ilyich Tchaikovsky
Passage: Pyotr Ilyich Tchaikovsky ( ; Russian: Пётр Ильи́ч Чайко́вский ; 25 April/7 May 1840 – 25 October/6 November 1893), often anglicized as Peter Ilich Tchaikovsky, was a Russian composer of the romantic period, some of whose works are among the most popular music in the classical repertoire.  He was the first Russian composer whose music made a lasting impression internationally, bolstered by his appearances as a guest conductor in Europe and the United States.  Tchaikovsky was honored in 1884, by Emperor Alexander III, and awarded a lifetime pension.
Title: Violin concerto
Passage: A violin concerto is a concerto for solo violin (occasionally, two or more violins) and instrumental ensemble, customarily orchestra.  Such works have been written since the Baroque period, when the solo concerto form was first developed, up through the present day.  Many major composers have contributed to the violin concerto repertoire, with the best known works including those by Bach, Bartók, Walton, Beethoven, Brahms, Bruch, Mendelssohn, Mozart, Paganini, Prokofiev, Shostakovich, Sibelius, Tchaikovsky, and Vivaldi.
Title: Violin Concerto in A major (Respighi)
Passage: The Violin Concerto in A major, P. 49 ("Concerto per Violino in La Maggiore") is Ottorino Respighi's first violin concerto, which was left unfinished by the composer in 1903, and then completed by Salvatore Di Vittorio in 2009.
Violin concerto Pyotr Ilyich Tchaikovsky