“It's a familiar theme in the story of America's musical evolution: At the dawn of the last century, when jazz first jitterbugged onto the national bandstand, uptight tastemakers considered it risqué, uncouth and demoralizing. Seen from the outside, its propulsive rhythms and improvisational swagger could only signal an uneducated turn away from the staid, swollen rigidity of the Classics. Jazz mov”