C.P.E. Bach, or Carl Philipp Emanuel Bach, was a German composer and musician born on March 8, 1714. He was the second son of the famous composer J.S. Bach and played a significant role in the transition from the Baroque to the Classical music period. C.P.E. Bach is known for his expressive and innovative style, particularly in keyboard music. He served as a court musician in Berlin and later in Hamburg, where he composed symphonies, sonatas, and vocal works. His music influenced many composers, including Haydn and Mozart, and he is often regarded as a key figure in the development of the sonata form.