Just after World War I, the musical style called jazz began a waterborne journey outward from that quintessential haven of romance and decadence, New Orleans. For the first time in any organized way, steam-driven boats left town during the summer months to tramp the Mississippi River, bringing an exotic new music to the rest of the nation. For entrepreneurs promoting jazz, this seemed a promising way to spread northward the exciting sounds of the Crescent City. And the musicians no longer had to wait for folks upriver to make their way down to New Orleans to hear the vibrant rhythms, astonishing improvisations, and new harmonic idioms being created.