"Changing Nigeria equals change for Africa": that's the message from the UN leader Ban Ki-moon as he met with President Buhari in Abuja, promising solidarity in the fight against terror. Also, in Libreville, the 14th African Growth and Opportunity Act Forum kicks off. US officials and 30 African delegations will be talking free trade and creating jobs. And we take a look at the traditional West African instrument, the kora. FRANCE 24 meets renowned players Toumani Diabate and N’Faly Kouyate.