Malian singing legend Oumou Sangare performing in Essaouira, Morocco in June 2012. Fadel Senna/AFP/Getty Images hide caption

itoggle caption Fadel Senna/AFP/Getty Images

Fatoumata Diawara and some of her musical collaborators on "Voices United for Mali" at a press conference held in Bamako, Mali on Jan. 17, 2013. Moustapha Diallo/courtesy of the artists hide caption

itoggle caption Moustapha Diallo/courtesy of the artists