The Requiem in D minor, K. 626, is a requiem mass by Wolfgang Amadeus Mozart (1756–1791). Mozart composed part of the Requiem in Vienna in late 1791, but it was unfinished at his death on 5 December the same year. A completed version dated 1792 by Franz Xaver Süssmayr was delivered to Count Franz von Walsegg, who commissioned the piece for a Requiem service to commemorate the anniversary of his wife's death on 14 February.
The autograph manuscript shows the finished and orchestrated Introit in Mozart's hand, and detailed drafts of the Kyrie and the sequence Dies irae as far as the first eight bars of the Lacrimosa movement, and the Offertory. It cannot be shown to what extent Süssmayr may have depended on now lost "scraps of paper" for the remainder; he later claimed the Sanctus and Agnus Dei as his own.
Walsegg probably intended to pass the Requiem off as his own composition, as he is known to have done with other works. This plan was frustrated by a public benefit performance for Mozart's widow Constanze. She was responsible for a number of stories surrounding the composition of the work, including the claims that Mozart received the commission from a mysterious messenger who did not reveal the commissioner's identity, and that Mozart came to believe that he was writing the requiem for his own funeral.
In addition to the Süssmayr version, a number of alternative completions have been developed by musicologists in the 20th century.
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audio file: by Bruno Walter; Wiener Philharmoniker; Wiener Staatsopernchor; Lisa della Casa, soprano; Ira Malaniuk, alto; Anton Dermota, tenor; Cesare Siepi, bass. [Public domain]
Brandt: We have some terrible news. Mr. Lebowski is in seclusion in the west wing.
[Brandt opens double doors and Mozart's Requiem Lacrimosa is playing]
Joel and Ethan Coen. The Big Lebowski (1998)
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After a little, he opened one of the drawers, took out an old music-book whose leaves were yellow with age, and began turning it over.
"There," he said to Miss Ophelia, "this was one of my mother's books,—and here is her handwriting,—come and look at it. She copied and arranged this from Mozart's Requiem." Miss Ophelia came accordingly.