Like Mahler's 10th Symphony, there are a few different versions of the Mozart Requiem, but only one of them, the "Sussmayr" version is performed with any regularity. Since Sussmayr, a pupil of Mozart's, is the main person who "completed" the Requiem, it has often been accepted as the "definitive" version of the Requiem.
Unlike Mahler's 10th, there are some movements of the Requiem which Mozart did not even sketch, such as the Sanctus, Benedictus, and Agnus Dei, according to Syssmayr. Did Sussmayr utilize any sketch material of Mozart's when completing these movements? It is probably impossible to say. The "Lacrimosa" had to be completed beyond the 8th bar, as Mozart did not go further than that. The manuscript is eerily incomplete. Legend has it Mozart was overcome with emotion while writing it - this last music he ever composed, and could not proceed. The translation of "Lacrimosa" is "mournful day."
Some other versions of the Requiem include a version by Franz Beyer, which attempts to reorchestrate some of Sussmayr's insensitive scoring and faulty harmonic realizations. Another more radical version is one by Richard Maunder, which omits the "Sanctus," "Osanna," and "Benedictus" altogether, and completes the "Lacrimosa" from the ninth bar onwards in a completely different way, concluding it with a fugal "Amen" based on sketches by Mozart that were discovered about 30 years ago.
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