End of August weather blankets summer in tragic lethargy. Groove away the stifling heat at MASS MoCA. First, Jupiter & Okwess brings their inventive blend of Afropop, traditional Congolese tempos, and Western rock. If you miss them, Cha Wa arrives soon after. Bass-heavy funk beats meet sousaphone and Bayou jazzy vocals. Cha Wa is a psychedelic blend, part New Orlean’s Mardi Gras, part India’s Holi. Two sonic salutes to summer. —C.J.F.