For 10 points, name this composition based on the Latin mass for the dead.
Andrew Lloyd Webber's only complete classical composition is this type of work. John Rutter
 composed one which includes words from the Book of Common Prayer. Krzysztof Penderecki incorporated
 the hymn "Swiety Boze" into his "Polish" one, while Luigi Cherubini wrote one in C minor. Maurice
 Duruflé wrote one of these works for organ and orchestra ending with the movement "In Paradisum,"
 inspired by an earlier one composed by Gabriel Faure. The piece of this type by Benjamin Britten is set to
 lines from poems by Wilfrid Owen, and is known as the "war" one. Its sections include the gradual, the
 sequence, and the offertory. For 10 points, name this composition based on the Latin mass for the dead.
Andrew Lloyd Webber's only complete classical composition is this type of work.
{requiem} masses