Music for the Requiem Mass in the context of Requiem (Mozart)

A Requiem (Latin: rest) or Requiem Mass, also known as Mass for the dead (Latin: Missa pro defunctis) or Mass of the dead (Latin: Missa defunctorum), is a Mass of the Catholic Church offered for the repose of the souls of the deceased, using a particular form of the Roman Missal. It is usually celebrated in the context of a funeral (where in some countries it is often called a Funeral Mass).

Musical settings of the propers of the Requiem Mass are also called Requiems, and the term has subsequently been applied to other musical compositions associated with death, dying, and mourning, even when they lack religious or liturgical relevance.

The War Requiem, Op. 66, is a choral and orchestral composition by Benjamin Britten, composed mostly in 1961 and completed in January 1962. The War Requiem was performed for the consecration of the new Coventry Cathedral, in the English county of Warwickshire, which was built after the original fourteenth-century structure was destroyed in a World War II bombing raid. The traditional Latin texts are interspersed, in telling juxtaposition, with extra-liturgical poems by Wilfred Owen, written during World War I.

Britten scored the work for soprano, tenor and baritone soloists, chorus, boys' choir, organ, and two orchestras (a full orchestra and a chamber orchestra). The chamber orchestra accompanies the intimate settings of the English poetry, while soprano, choirs and orchestra are used for the Latin sections; all forces are combined in the conclusion. The Requiem has a duration of approximately 80–85 minutes. In 2019, Britten's 1963 recording of the War Requiem was selected by the Library of Congress for preservation in the National Recording Registry for being "culturally, historically, or aesthetically significant".

A musical setting is a musical composition that is written on the basis of a literary work. The literary work is said to be set, or adapted, to music. Musical settings include choral music and other vocal music. A musical setting is made to particular words, such as poems. By contrast, a musical arrangement is a musical reconceptualization of a previously composed work, rather than a brand new piece of music. An arrangement often refers to a change in medium or style and can be instrumental, not necessarily vocal music.

Texts commonly used in choral settings include the mass and the requiem in Western Christianity, and the Divine Liturgy of St. John Chrysostom and the All-night vigil in Eastern Christianity. Examples include Mozart's Great Mass, and Leontovych's Liturgy of St. John Chrysostom.

André Campra (French: [kɑ̃pʁa]; baptized 4 December 1660 – 29 June 1744) was a French composer and conductor of the Baroque era. The leading French opera composer in the period between Jean-Baptiste Lully and Jean-Philippe Rameau, Campra wrote several tragédies en musique and opéra-ballets that were extremely well received. He also wrote three books of cantatas as well as religious music, including a requiem.