Carl Philipp Emanuel Bach (8 March 1714 – 14 December 1788) was a German musician and composer, the second of three sons of Johann Sebastian Bach and Maria Barbara Bach. He was a crucial composer in the transition between the Baroque and Classical periods, and one of the founders of the Classical style, composing in the Rococo and Classical periods. His second name was given in honor of Georg Philipp Telemann, a friend of Emanuel's father and his godfather.


Through the latter half of the 18th century, the reputation of Emanuel Bach stood very high. Wolfgang Amadeus Mozart said of him, "He is the father, we are the children." The best part of Joseph Haydn's training was derived from a study of his work. Ludwig van Beethoven expressed for his genius the most cordial admiration and regard. This position he owes mainly to his keyboard sonatas, which mark an important epoch in the history of musical form. Lucid in style, delicate and tender in expression, they are even more notable for the freedom and variety of their structural design; they break away altogether from both the Italian and the Viennese schools, moving instead toward the cyclical and improvisatory forms that would become common several generations later.
The content of his work is full of invention and, most importantly, extreme unpredictability, and wide emotional range even within a single work, a style that may be categorised as Empfindsamer Stil. It is no less sincere in thought than polished and felicitous in phrase. He was probably the first composer of eminence who made free use of harmonic colour for its own sake since the time of Lassus, Monteverdi, and Gesualdo. In this way, he compares well with the most important representatives of the First Viennese School. In fact he exerted enormous influence on the North German School of composers, in particular Georg Anton Benda, Bernhard Joachim Hagen, Ernst Wilhelm Wolf, Johann Gottfried Müthel, Friedrich Wilhelm Rust and many others. His influence was not limited to his contemporaries, and extended to Felix Mendelssohn and Carl Maria von Weber.