You checked your cynicism at the door Sunday night when entering the show from Michael Franti and Spearhead at the South Shore Music Circus in Cohasset. If you didn't, it was most likely sung and danced out of you by evening's end.Who else does a show like this? The details were 16 songs and about 95 minutes for Franti and Spearhead's headlining set, but the reality was a raucous, joyful revival meeting where hardly anyone who could stand wasn't dancing and clapping and singing [...]