Requiem in the context of "Libretto"

In Memoriam A.H.H. (1850) by Alfred, Lord Tennyson, is an elegy for his Cambridge friend Arthur Henry Hallam, who died of cerebral haemorrhage in Vienna, at the age of twenty-two years, in 1833. As a sustained exercise in tetrametric lyrical verse, Tennyson's poetical reflections extend beyond the meaning of the death of Hallam, thus, In Memoriam also explores the random cruelty of Nature seen from the conflicting perspectives of materialist science and declining Christian faith in the Victorian era (1837–1901), the poem thus is an elegy, a requiem, and a dirge for a friend, a time, and a place.

Music for the Requiem Mass is any music that accompanies the Requiem, or Mass for the Dead, in the Catholic Church. This church service has inspired hundreds of compositions, including settings by Victoria, Mozart, Berlioz, Verdi, Fauré, Dvořák, Duruflé and Britten. For centuries settings of the Mass for the Dead were to be chanted in liturgical service monophonically. Later the settings became polyphonic, Victoria's famous 1605 a cappella work being an example. By Mozart's time (1791) it was standard to embed the dramatic and long Dies irae (Day of Wrath) sequence, and to score with orchestra. Eventually many settings of the Requiem, not least Verdi's (1874), were essentially concert pieces unsuitable for church service.

The Messa da Requiem is a musical setting of the Catholic funeral mass (Requiem) for four soloists, double choir and orchestra by Giuseppe Verdi. It was composed in memory of Alessandro Manzoni, whom Verdi admired, and is therefore also referred to as the Manzoni Requiem. The first performance, at the San Marco church in Milan on 22 May 1874, conducted by the composer, marked the first anniversary of Manzoni's death. It was followed three days later by the same performers at La Scala. Verdi conducted his work at major venues in Europe.

Verdi composed the last part of the text, Libera me, first, as his contribution to the Messa per Rossini which he had begun after Gioachino Rossini had died already contained the music that later begins the Dies irae sequence.