Carl Philipp Emanuel Bach (1714–1788) was a German Classical period musician and composer, the fifth child and second (surviving) son of Johann Sebastian Bach and Maria Barbara Bach. His second name was given in honor of his godfather Georg Philipp Telemann, a friend of Johann Sebastian Bach. C. P. E. Bach was an influential composer working at a time of transition between his father's baroque style and the classical and romantic styles that followed it. His personal approach, an expressive and often turbulent one known as empfindsamer Stil or ’sensitive style’, applied the principles of rhetoric and drama to musical structures. Bach was a prolific writer of keyboard sonatas, many of which were intended for his favored instrument, the clavichord.