Carl Philip Emmanuel Bach (born, Weimar, March 14, 1714; died, Hamburg, Dec. 14, 1788), the third son of Sebastian Bach, was by nature and artistic taste fitted for the work which his father did not attempt. We have already noticed his theory that one should play the clavichord and write for it in the singing style. It was his feeling for this style and his keen insight into the capabilities of his instrument which made him, though not a composer of genius, a powerful agent in the establishment of the modern sonata form,--so powerful, indeed, that he has been called the father of the sonata. We owe something, however, to the demands of public taste. Music-lovers have usually, with the exception of the few, preferred the purely sensuous beauty of music to its intellectual qualities. They grew weary in those days of the severity of the fugue form; and the composers of the time naturally endeavored to supply them with what they desired, something easily, rhythmically pleasing. For years after Emmanuel Bach's day it continued to be the aim of composers to write with elegance and taste. Emmanuel Bach excluded polyphonic writing from his sonatas, and adopted a style entirely monophonic. He contributed toward the development of the sonata in the direction of clearness and symmetry, and he insisted upon a well-regulated contrast of keys and of the characters of the different movements. In short, he established the outline of the sonata, with the exception of duality of themes, determined the direction in which it was to develop, and gave it a powerful impulse. The first sonatas in which Emmanuel Bach showed his ability were six published in 1742, and dedicated to Frederick the Great.[10.1] The opening movement of each is in the sonata form, as it existed then. The principal theme is properly announced, there is a short section of "working out," and a conclusion with the principal theme in the tonic key. In the working out the composer does not use the principal key, and thus in returning to it in his conclusion gets the effect of repose. In at least one of these sonatas, the second, there is a clearly marked second theme in the first part. There are touches of humor here and there in these sonatas, and some of the slow movements are full of feeling. The finales are all light and lively. [10.1] The author desires to acknowledge his indebtedness at this particular point to "The Pianoforte Sonata," by J. S. Shedlock.