Like many Americans, I often feel the funkiness rising up inside me. It sometimes needs purging. There’s no better opportunity than the one provided tonight at Maysles Cinema, screening Soul Power, a terrific concert documentary filmed in Africa. (It also plays tomorrow night and Wednesday at 7:30pm.) The movie captures legends like James Brown and B.B. King at the peak of their substantial gifts. Backstage: a playful Muhammad Ali, serenly confident of his soon-to-be-mythic victory over George Foreman in the Rumble in the Jungle.








