"For my part, Mozart's work really does the trick for me when I need to be re-energized. Therefore, I believe that his Requiem is the greatest work of all time."
I hate to tell you this because I'm not really an expert on it, but I have read about the Requiem. It is a great work, but it is very possible that Mozart didn't write all of it.
There are some very un-Mozartians portions of the work.
See reference here: http://www.its.caltech.edu/~tan/Mozartreq/main.html
Requeim Mass K.626 by Mozart
movements composers who contributed
Requiem Requeim composed by Mozart
Kyrie Kyrie composed by Mozart ecxept the Colla-parte accompaniment, which was written by Franz Jacob Freystadler
Sequence Dies irae Mozart finished the four part vocal score, the instrumental bass, and the motivic portions of the instrumentation Joseph Eybler wrote the instrumentation; later Sussmayer copies Eybler's instrumentation with some minor revisions
Tub mirum sam as above same as above
Rex tremendae same as above same as above
Recordare same as above same as above
Confutatis same as above same as above
Lacrimosa Mozart finished only through the eighth measure Joseph Eybler write the instrumentation for mm. 9-10; Sussmayer wrote the instrumentation for mm.1-8 and composed mm. 9-30
Offertory Domine Jesu Mozart finished the four-part vocal score, the instrumental bass, and the motivic portions of the instrumentation Abbe Stadler might have worked on the instrumentation; Sussmayer wrote the instrumentation or used Stadler's with some revisions
Domine Hostias same as above same as above
Sanctus Sanctus Sussmayer's composition
Benedictus Benedictus Sussmayer's composition
Agnus Dei Agnus Dei Sussmayer's composition, but here he may have used some of Mozart's drafts**
Communion Lux aeterna Requiem composition measures 23-52 by Mozart are reused; adjusted slightly for the different text
Cum sanctis tuis Kyrie composition mm. 1-52 by Mozart is reused; adjusted slightly for the different text
**There has been many criticisms of Sussmayer's contributions. The main criticism is focused on Sanctus and Benedictus. However, with Agnus Dei, Wolff believes that it "juxtaposes a highly balanced and, in terms of rhetorical intensity, extremely effective four-part vocal setting and a complementary instrumental motif, exactly according to the manner of, for instance, the 'Domine Jesu'." Many speculate that Constanze gave Sussmayer drafts that Mozart had been working on. Some of these may have contained instructions or preliminary vocal ideas for not only Agnus Dei but also Sanctus and Benedictus. (these drafts were mentioned by Constanze in a letter to Stadler in 1827.)
My favorite if still Handel's Messiah.
That guy, Salieri, helped him.
Well, in the movie he did.
LOL. Great minds think alike! See my Post 91.
Same website even.
Mozart wrote everything up to Lacrimosa. After that, the rest was written by a student of his. It was a valiant effort but, it's like watching a football game where the first string plays inspired football and build up a huge lead but then the coach puts in the second string in the final quarter. Just not the same.