Sundiata: An Epic of Old Mali - D.T. Naine
In the introduction, D. T. Niane explains that he got this story largely from the telling of an old griot in a village in Guinea.

I love traditional wonder tales, and this is a fine one, and enticingly told. It's full of rivalries, sorceries both for and against the hero, clever negotiation of politics as well as magic, heroic speeches (and plenty of proverbs, a distinctive aspect of its style). Also wily women, although this particular storyteller downplays the role of women so much that some passages become downright confusing, and it's up to the notes to explain that this woman did such-and-such and that's why the events of the chapter happened the way they did. And the griot makes sure to give a large role to griots in the story (which gives rise to some of the best passages, like the one about the magical balafon), as well as putting in various statements of the importance of the craft.