DESCRIPTION:
The Requiem Mass in D minor (K. 626) by Wolfgang Amadeus Mozart was composed in Vienna in 1791 and left unfinished at the composer's death.

http://en.wikipedia.org/wiki/Requiem_%28Mozart%29

Dies Irae (Day of Wrath) is a thirteenth century Latin hymn thought to be written by Thomas of Celano (1200 - 1265). It is a medieval Latin poem characterized by its accentual stress and its rhymed lines. The metre is trochaic. The poem describes the day of judgment, the last trumpet summoning souls before the throne of God, where the saved will be delivered and the unsaved cast into eternal flames.

http://en.wikipedia.org/wiki/Dies_Irae

Structure of REQUIEM

The Sussmayr completion of the Requiem is divided into fourteen movements, with the following structure:

* I. Introitus: Requiem aeternam (choir and soprano solo)
* II. Kyrie eleison (choir)
* III. Sequentia (text based on sections of the Dies Irae):
o Dies irae (choir)
o Tuba mirum (soprano, contralto, tenor and bass solo)
o Rex tremendae majestatis (choir)
o Recordare, Jesu pie (soprano, contralto, tenor and bass solo)
o Confutatis maledictis (choir)
o Lacrimosa dies illa (choir)
* IV. Offertorium:
o Domine Jesu Christe (choir with solo quartet)
o Versus: Hostias et preces (choir)
* V. Sanctus:
o Sanctus Dominus Deus Sabaoth (choir)
o Benedictus (solo quartet, then choir)
* VI. Agnus Dei (choir)
* VII. Communio:
o Lux aeterna (soprano solo and choir)