This page was created by James A. Brokaw II.  The last update was by Elizabeth Budd.

Commentaries on the Cantatas of Johann Sebastian Bach: An Interactive Companion

Petzoldt 1993

Petzoldt, Martin. “‘Die kräfftige Erquickung unter der schweren Angst-Last’: Möglicherweise Neues zur Entstehung der Kantate BWV 21.” BJ 79:31–46.

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