It looked an enervating prospect: an entire disc devoted to Bach family members who in several cases are too obscure for any musical encyclopaedia smaller than Grove. The result – consistently well played on an organ in Melk Abbey, Austria – quickly banishes boredom to prove an improbable artistic success, aided by a beautifully austere cover design.

Heinrich Bach died in 1692, but the chorale prelude with which this CD begins sounds so pleasantly old-fashioned as to imply a 16th rather than 17th-century composer. By contrast, the Prelude and Fugue in E Flat by Heinrich’s son, the underrated Johann Christoph Bach (1642-1703), second cousin of Johann Sebastian), could easily be mistaken for Buxtehude. The Fugue in C Minor by a much better known figure, WF Bach, likewise possesses real distinction, tending to justify the hopes which JSB placed in his eldest son, and inspiring in at least one listener a desire to track down the rest of WF’s organ output.

Uniquely among the compositions on this release, the remarkably effective fugue by Johann Christian Bach – not the eponymous ‘English Bach’, but a younger man whose dates were 1745-1814 – is based on the B-A-C-H theme afterwards so profitable to...