Two distinctive aspects of Bach's setting spring from his other church endeavors. One is the double-choir format, which stems from his own double-choir motets and those of many other composers with which he routinely started Sunday services. The other is the extensive use of chorales, which appear in standard four-part settings, as interpolations in arias, and as a cantus firmus in large polyphonic movements. This is notable in "O Mensch, bewein dein’ Sünde groß", the conclusion of the first half – a movement which Bach also used as an opening chorus for the second version (1725) of his St John Passion (later – ca. 1730 – he reverted to the originally composed "Herr, unser Herrscher" there).[2] The opening chorus, "Kommt, ihr Töchter, helft mir klagen" is also notable for the use of chorale cantus firmus, in which the soprano in ripieno crowns a colossal buildup of polyphonic and harmonic tension, singing a verse of "O Lamm Gottes, unschuldig." This was sung in only in 1742 and 1743–1746 and had been played on the organ before.
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