Essay on The True Art of Playing Keyboard Instruments

Carl Philipp Emanuel Bach (8 March 1714 – 14 December 1788) also formerly spelled Karl Philipp Emmanuel Bach and commonly abbreviated C. P. E. Bach, was a German Classical period musician and composer, the fifth child and second surviving son of Johann Sebastian Bach and Maria Barbara Bach.
C. P. E. Bach was an influential composer working at a time of transition between his father's Baroque style and the Classical style 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. His dynamism stands in deliberate contrast to the more mannered galant style also then in vogue.