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In page Maurice Duruflé:

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In 1947 he completed probably the most famous of his few pieces: the Requiem op. 9, for soloists, choir, organ, and orchestra. He had begun composing the work in 1941, following a commission[4] from the Vichy regime. Also in 1947, Marie-Madeleine Chevalier became his assistant at St-Étienne-du-Mont. They married on 15 September 1953.[5] (Duruflé's first marriage to Lucette Bousquet, in 1932, ended in civil divorce in 1947 and was declared null by the Vatican on 23 June 1953.) The couple became a famous and popular organ duo, going on tour together several times throughout the sixties and early seventies.[citation needed]