One of the more puzzling remarks about the music of Carl Philipp Emanuel Bach came from Mozart, who said that anyone who listened closely would realize his debt to the German composer. That seemed unlikely, given that Mozart only rarely availed himself of the Sturm und Drang ("storm and stress") style of C.P.E.'s keyboard music. But listen to this release by flutist Emmanuel Pahud and you'll get an idea of what Mozart was talking about. It's not just that the flute concertos are basically galant in style, not Sturm und Drang. It's a certain nervous energy that makes the flute bloom rapidly out of squarish themes and keeps you guessing as to what's coming next.