The New Orleans Jazz and Heritage Festival kicks off Thursday, and if this doesn’t make you wish you were there I don’t know what would. A local media outfit had the idea of getting musicians to play in the back of mule-drawn carriages while riding through town. Taj Mahal and his rhythm section were filmed five years ago sauntering down Dauphine Street during Jazzfest on what seems to be a Sunday morning. Only in New Orleans would passersby not bat an eye at the sound. Taj Mahal is back this year, playing at the Fairgrounds Thursday.