A fughetta on the hymn tune "Wir glauben all' an einen Gott", in which the fugue subject derives directly from the hymn but manifests in the garb of a stately French Ouverture melody. Take note of the harmonic suspensions (including double suspensions forming as it were momentary hexachordal clusters), often associated with French organ music of the Baroque. The central section, a developmental episode that sequentially spins forth motives derived from the hymn, leads to a conclusion in which a stretto-saturated counter-exposition (serving as a kind of modified recapitulation of the first section) prefigures an ecstatic coda ending on the dominant triad (arguably a variant on the traditional plagal cadence).
Feel free to peruse the full engraved score here:
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