I walked through the Preservation Hall tent and sat for a minute to check out the PHJB - with Hall director Ben Jaffe playing tuba, which I think is fairly rare for in-town shows - and had a complete loss of awareness of my surroundings as the band led a brief second line during “St. Louis Blues.” I really had a whole thirty seconds or so that I thought I was at Jazz Fest. Maybe too much Voodoo for me.