(b Weimar, 1714; d Hamburg, 1788).
Ger. composer. 5th child and 3rd son of J. S. Bach. Intended for legal career but turned to mus. while at Frankfurt Univ. In 1738 became cembalist in Berlin at court of Frederick the Great, holding this post until 1767, when he succeeded Telemann as dir. of church mus. at Hamburg. Applied unsuccessfully in 1750 to succeed his father at Leipzig. His achievement was to develop sonata‐form and invest it with weight and imaginative quality, most evidently in his kbd. sonatas, of which there are over 200, but also in his sinfonias, concs. (over 50), vn. sonatas, and the masterly solo fl. sonata in A minor. Also comp. 22 Passions, Magnificat (1749), the oratorios Die Israeliten in der Wusten (1769) and Die Auferstehung und Himmelfahrt Jesu (1780), and many songs. Wrote celebrated treatise on klavier‐playing.