Who was the only known grandson of Johann Sebastian Bach to become a composer?

Wilhelm Friedrich Ernst (WFE) Bach (1759-1845) was born in Bueckeburg in the state Lower Saxony to Johann Christoph Friedrich Bach (1732-1795), in turn 'Kapellmeister' to the Count of Schaumburg-Lippe. 'Kapellmeister' literally translates to 'master of the chapel choir', but it could also mean court composer and leader of the musical ensemble, often meaning both.

WFE Bach received musical training from uncle Johann Christian (1735-1782) in London till the latter's death. WFE Bach eventually returned to his homeland, assuming numerous posts, most notably 'Kapellmeister' of Minden in Nordrhein-Westfalen (North Rhine-Westphalia), of which larger cities include Cologne, Aachen and Essen. Eventually, he came to Berlin in 1788, appointed Kapellmeister of Prussia by King Friedrich Wilhelm II, whose brother Prince Heinrich granted WFE Bach a pension in 1811.

Like so many from the massive Bach family whose works have languished in varying degrees and lengths of obscurity, the work of WFE Bach particularly benefited from ongoing scholarly and critical half-century-plus interest in forgotten music from the Medieval, Renaissance, Baroque and Classical periods and corresponding efforts of those acting as 'musical archaeologists'. Much of the work of WFE Bach received their first modern performances only in the last forty years, notably the cantatas (works for chorus; one or more vocal soloists; and orchestra) "Westphalia's Joy" and "Columbus, or the Discovery of America".