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Requiem (Mozart)
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. A completion by Franz Xaver Süssmayr was delivered to Count Franz von Walsegg, who had anonymously commissioned the piece for a requiem Mass to commemorate the February 14 anniversary of his wife's death.
It is one of the most enigmatic pieces of music ever composed, mostly because of the myths and controversies surrounding it, especially around how much of the piece was completed by Mozart before his death.
Composition
At the time of Mozart's death on 5 December 1791, only the opening movement (Requiem aeternam) was completed in all of the orchestral and vocal parts. The following Kyrie and most of the sequence (from Dies Irae to Confutatis) were complete only in the vocal parts and the continuo (the figured organ bass), though occasionally some of the prominent orchestral parts were briefly indicated, such as the violin part of the Confutatis and the musical bridges in the Recordare. The last movement of the sequence, the Lacrimosa, breaks off after only eight bars and was unfinished. The following two movements of the Offertorium were again partially done; the Domine Jesu Christe in the vocal parts and continuo (up until the fugue, which contains some indications of the violin part) and the Hostias in the vocal parts only.
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):
Tuba mirum (soprano, contralto, tenor and bass solo)
Rex tremendae majestatis (choir)
Recordare, Jesu pie (soprano, contralto, tenor and bass solo)
Confutatis maledictis (choir)
IV. Offertorium:
Domine Jesu Christe (choir with solo quartet)
Versus: Hostias et preces (choir)
V. Sanctus:
Sanctus Dominus Deus Sabaoth (choir)
Benedictus (solo quartet, then choir)
VI. Agnus Dei (choir)
VII. Communio:
Lux aeterna (soprano solo and choir)
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