Gypsy jazz — the late guitarist Django Reinhardt’s swinging mix of flamenco and Parisian street songs — exerts an enduring influence on music. The HCoSF, featuring hot guitarist Paul Mehling, is one of the longest-running Django-style combos. With Mehling’s picking, the band’s insouciant swing and willingness to tinker with the form the Hot Club transports listeners to the smoky Parisian cafes of the ‘30s.