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Bach : The messe in b minor, BWV 232

A work of grandeur, an opus ultimum, it was not composed as such but is the result of an assembly of pieces written at different times and for different circumstances. The idea of bringing together pieces drawn essentially from the vast corpus of cantatas was not unusual; a similar approach was taken by several of his contemporaries, such as Handel, and Bach himself had done so for the short masses he composed in the late 1730s. These were called parodies.