“The Malian singer Fatoumata Diawara has always been about the future. The image of her toting an electric guitar – which she has said is a first for a female Malian singer – tells you as much, as does her new video, Nsera, a dazzling parade of Afro-futurist images with “Fatou” in assorted stunning costumes. Her two previous albums have remained broadly in Mali’s wassoulou traditions while introduc”