It’s hard to get a handle on Nigerian musicians Nash Dodoo, Charlie Cuul and Jonas Caulley. In 1980 they released an album of face-melting gospel boogie as the BML chapels. And in the same year, calling themselves the Beta Yama Group, they put out Free Love, a belated love letter to San Francisco’s Summer of Love and an album altogether focused on more worldly concerns. Free Love is a small slice of Haight-Ashbury transported to the Polygram Studios in Lagos. ‘Te Revoir’ is Mamas and Papas jammi…