Two documentaries on the Nigerian musician whose “Afro-beat” has become Africa’s dominant pop mode. Dennis Marks’s Teacher Don’t Teach Me Nonsense—The Music of Fela Kuti was filmed during a 1984 tour of England and concentrates on Fela’s musical roots and politics; Stephane Tchalgadjieff’s Music Is the Weapon: Fela looks at his position in his native country, where he was arrested for trying to smuggle currency out of the country.