Johann Sebastian Bach composed the church cantata O Ewigkeit, du Donnerwort, BWV 20, in Leipzig for the first Sunday after Trinity and first performed it on 11 June 1724. It is the first cantata he composed for his chorale cantata cycle, the second annual cycle he began in Leipzig. The cantata is based on Johann Rist's hymn "O Ewigkeit, du Donnerwort" (1642), with a chorale melody by Johann Schop.
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