"Carl Philipp Emanuel Bach and the keyboard concerto-a lifelong relationship, challenging and exhaust-ing, altogether fruitful, brilliant, and even spectacular into the bargain. As a 19-year-old (under the eyes of his father, so to speak) he wrote in Leipzig his first keyboard concerto; at the age of 74 in Hamburg he finished, in the year of his death, his last example of the genre. In-between lies a treasury of fifty keyboard concertos, colossal and fathomless.