It's a Sunday evening in early Summer. As New Orleans steams off after a thunderstorm, the Algiers Brass Band kicks off a relaxed BBQ at Donna's. The Cajun Fais Do-Do two-steps and spins its way through Tipitina's.

In Chicago, it's a windy 60 degrees. Hundreds of slow-burning candles are being lit and dispersed around the Double Door Club, in preparation for local acid-jazz sensation Liquid Soul's weekly throw down. Business as usual, except for the surprise opening act on tonight's bill: ...