Sinfonia da Requiem, op. 20

Sinfonia da Requiem, Op. 20, for orchestra is a sinfonia written by Benjamin Britten in 1940 at the age of 26. It was one of several works commissioned from different composers by the Japanese government to mark Emperor Jimmu's 2600th Anniversary Celebrations of the Japanese Empire (taken to be 11 February 660 BCE from birth of Emperor Jimmu). The Japanese government rejected the Sinfonia for its use of Latin titles from the Catholic Requiem for its three movements and for its somber overall character, but it was received positively at its world premiere in New York on 29 March 1941 under John Barbirolli. A performance in Boston under Serge Koussevitzky led to the commission of the opera Peter Grimes from the Koussevitzky Music Foundations.