Caspar Daniel Krohn (1736-1801) was organist in St. Petri and St. Johannis at Hamburg. This church housed the Arp Schnitger organ that was sold later to Cappel. Typical for Krohn's few surviving chorale preludes are "harmonic experiments".
Score: Norddeutsche Orgelmusik aus klassisch-romantischer Zeit (1780-1860), Carus 18.026/10