Friedrich Wilhelm Zachow, Wenn mein Stündlein (LV 12)
Like a lot of Zachow’s choral preludes. this one is also a fugue on the first phrase of the choral melody. In this case Zachow also employs a countersubject that he maintains throughout the piece. Zachow was a craftsman in counterpoint as he shows in this piece: the countersubject is written in double counterpoint, meaning it can be played both above and below the fugue subject without violating voice leading rules.
The recording was done with the Hauptwerk software and the sampleset, made by Sonus Paradisi, of the Hinsz organ in the Reformed church in the Midwolda