BEST AFRICAN GROOVES: Tinariwen and Imarhan Timbuktu

Two five-piece bands originating from the Sahara desert in Mali provided the festival's best one-two guitar punch on Friday night, stretching blues licks into rolling grooves that never seemed to end, just to sometimes reach new heights in flourishes of drumming or ululation. Where an American band would ask the crowd, "Are you having a good time?" their custom was to inquire, "Are you happy?" Yes, we were very happy.