As New Orleans continues to remind itself why it matters after Katrina, here is a photo history to abet the process. Historic Photos of New Orleans Jazz is the most extensive since Al Rose’s New Orleans Jazz: a Family Album, which covered the early years and is out-of- print in any case. There are almost 200 images here, most drawn from the Louisiana State’s Museum Jazz Collection. Some are obvious choices, like the only known photo of Buddy Bolden, or Louis Armstrong as King of Zulu. Many others will have you gasping, laughing or oohing and aahing with approval (My fave: the dancers Kidney Stew and Pork Chops with Sharkey Bonano’s band at the Municipal Auditorium). All of these photos of six-and-seven-piece traditional jazz bands feed nostalgia for a bygone music culture and the hope that some kind of trad jazz revival is in the wings.