The concerts , called Roll Back Malaria and held in the 40,000-capacity Iba Mar Diop stadium in Dakar on Saturday and Sunday , were organized by Youssou N ` Dour , left , the don of African music , and had one of the biggest lineups of top African musicians ever staged on the continent , including Orchestra Baobab and Baaba Maal from Senegal ; Rokia Traore and Salif Keita from Mali ; the Benin-born Angelique Kidjo ; Cheb Khaled from Algeria ; and Manu Dibango from Cameroon , reported Agence France-Presse and other news services .