I think that it is interesting that Jung saw Africa as the Dark Continent, but because he thought of himself as the "other", he became disturbed when he found himself "becoming too black," and felt fear when they began to play drums, and felt that it was overtaking him.
The truth is, he was one of them, as we are all part of the human race.
I have talked to folks in my African Dance class. The drummers sometimes seem to hear voices, their names called, etc. One drummer kept hearing "Grandfather." And when the rhythm is right, it causes you to dance wildly, the same way a good song causes you to jump up and be exceedingly happy.
I think it has little to do with spiritism, if that is the word, except that the human spirit relates to it, and the body follows.
Think of how many people enjoy dancing, working their bodies to such an extreme, more than many sports at times, until they seem to transcend. And on a spiritual level, maybe they do.