Azizi -New Orleans is where Jazz really got going , and a lot of early jazzmen were hearing the early bluesmen and were influenced by them . As a result , a lot of jazz was in 12 bar format , with a strong feel for the Bluesy side of things . As Jazz developed , the vocalists used a lot of Blues styling in presenting the 'Words' that went with the tunes . So Jazz Blues is just another developement of blues in the same way that Chicago and West Coast and Kansas City Blues are .