The special effects in Carl Philipp Emanuel Bach's music helped forge a new cutting-edge style. /De Agostini/Getty Images hide caption itoggle caption /De Agostini/Getty Images Deceptive Cadence Calculated Instability: The Pioneering Sonatas Of C.P.E. Bach November 20, 2012 The quirky musical habits of J.S. Bach's most impressive son would later become standard practice for composers of the next generation. British pianist Danny Driver uncovers the impetuous mood swings, curious key changes and whiplash stops and starts that define Bach's leading-edge style.