O Ewigkeit, du Donnerwort, BWV 20

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O Ewigkeit, du Donnerwort, BWV 20 is a chorale cantata by Johann Sebastian Bach, written in Leipzig for the First Sunday after Trinity and first performed on 11 June 1724. It began Bach’s second year as Thomaskantor and started his second yearly cycle of cantatas, which focused on chorale cantatas based on Lutheran hymns.

The work centers on the 1642 hymn O Ewigkeit, du Donnerwort by Johann Rist, with a tune by Johann Schop. The text deals with death and eternity and fits the Sunday’s gospel about the Rich Man and Lazarus (Luke 16:19–31) and the Epistle reading about God’s love (1 John 4:16–21). For the cantata, the first stanza of the hymn is used unchanged, and two additional stanzas are used to conclude the two parts. The rest of the hymn’s stanzas are paraphrased into recitatives and arias by an unknown poet, possibly Andreas Stübel.

The cantata has two parts: Part I with seven movements to be sung before the sermon, and Part II with four movements to be sung after the sermon. The opening movement is a chorale fantasia in the style of a solemn French Overture, with the hymn tune sung as a cantus firmus by the soprano and doubled by the slide trumpet. Both parts end with the same four-part chorale setting using the closing stanzas. The middle movements are mainly alternating recitatives and arias, with the last aria forming a duet.

Bach scored the work for three vocal soloists (alto, tenor and bass), a four-part choir (SATB), and a Baroque orchestra: tromba da tirarsi, three oboes, two violins, viola and basso continuo. The overall duration is about 31 minutes.

The hymn tune by Schop appears in the movements that use Rist’s text, and Bach’s paraphrasing keeps close to the hymn’s ideas. The opening and closing chorales provide a unifying frame for the cantata.

Scholars note Bach’s intense treatment of eternity and judgment in this work, with dramatic musical contrasts to reflect the gravity of the theme. The cantata was the first of Bach’s chorale cantatas for his second annual cycle and helped shape how he would set hymns into a sequence of expressive, text-driven movements.