Reddit mentions of Dancing Prophets: Musical Experience in Tumbuka Healing (Chicago Studies in Ethnomusicology)

I'm not sure about general surveys, and I'm also not sure about the distinction you're drawing between esotericism and traditional African religions, but I can provide two good case studies. E.E. Evans-Pritchard's film Witchcraft Among the Azande (Youtube link to full film) is a classic of ethnography (and therefore a bit dated), depicting divination and other practices among the Azande people of central Africa. The other is Steven Friedson's book Dancing Prophets: Musical Experience in Tumbuka Healing, which deals with divination within the frame of medical diagnosis among the Tumbuka people of Malawi. You might also be interested in West African secret societies (e.g. Poro, Sande).