In the aftermath of Hurricane Katrina, as the citizens of New Orleans regroup and put down roots elsewhere, many wonder what will become of one of the nation's most complex creole cultures. New Orleans emerged like Atlantis from under the sea, as the city in which some of the most important American vernacular arts took shape. Creativity fostered jazz music, made of old parts and put together in utterly new ways; architecture that commingled Norman rooflines, West African floor plans, and native materials of mud and moss; food that simmered African ingredients in French sauces with Native...