Requiem, K.626 - 5.
The Requiem Mass in D minor by Wolfgang Amadeus Mozart was composed in Vienna in 1791 and left unfinished at the composer's death on December 5. A completion dated 1792 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.
You must read about it: http://en.wikipedia.org/wiki/Requiem_%28Mozart%29 1
Gundula Janowitz (soprano)
Christa Ludwig (contralto)
Peter Schreier (tenor)
Walter Berry (bass)
Chor der Wiener Staatsoper
Wiener Symphoniker
Conductor : Karl Böhm