In the wake of Hurricane Katrina, everybody is acknowledging New Orleans’ musical importance, even Bonnaroo. There were high profile events such as Elvis Costello and Allen Toussaint performing songs from their collaborative effort The River in Reverse, and there were less celebrated forms of recognition. The Preservation Hall Jazz Band was given its own tent, and scheduled more playtime than any other act on the bill. Saturday’s midnight show also saw a Crescent City tour de force, ...