Carl Philipp Emanuel, the second son of Johann Sebastian, achieved greater renown in his day than either his father or his brothers. He served as harpsichordist of King Frederick the Great in Berlin and Potsdam for 29 years, after which he succeeded his godfather, Georg Philipp Telemann, as director of church music in Hamburg. Among his compositions are over 200 keyboard sonatas, 22 passions, two oratorios, many songs, concertos and sinfonias. He infused vitality into the musical life of Hamburg by organizing subscription concerts. He played a part in the Handel Renaissance and he took risks by performing less accessible works, such as his father’s B Minor Mass. The Hamburg bourgeoisie supported the concerts enthusiastically, especially those in which Bach captivated his audiences with his harpsichord playing. He also wrote a celebrated treatise, "The Art of Playing the Keyboard", in which he discussed improvisation, accompanying, performance and thorough-bass. In addition to his ground-breaking musical activity, Carl Philipp Emanuel collected art and read widely, motivated by a desire for a wide-ranging education. Savoring the exchange of ideas, he frequently entertained visitors in his home. (He continued a family tradition of offering hospitality to traveling musicians, as did his father. He described his father’s house as a “pigeonry” with people swarming in and out all the time.) These might be family and friends as well as those who were attracted by his reputation as an "Originalgenie". As he explained in his biography, these contacts were extremely important to him because they broadened his horizons, provided him with all sorts of stimuli for composition and helped to refine his musical outlook. Painters, poets, and composers were unanimous in praise of his hospitality. Charles Burney’s principal reason for including Hamburg in his itinerary through central Europe was his desire to meet Carl Philipp Emanuel Bach. "When I went to his house, I found him with three or four rational, and well-bred persons, his friends besides his own family…The instant I entered he conducted me up stairs, into a large and elegant music room, furnished with pictures, drawings, and prints of more than a hundred and fifty eminent musicians….and original portraits in oil of his father and grandfather. …M. Bach was so obliging as to sit down to his Silbermann clavichord …upon which he played three or four of his choicest and most difficult compositions with the delicacy, precision, and spirit, for which he is so justly celebrated among his countrymen. After dinner, which was elegantly served and cheerfully eaten, I prevailed upon him to sit down again to a harpsichord, and he played, with little intermission, till near eleven o’clock at night."