Music of Africa & Copyrightable Intros - Les Têtes Brulées, Four Brothers & Thomas Mapfumo

I've been passionate about world music since I was a little kid and heard some of my parents bossa nova albums, Antonio Carlos Jobim, Perez Prado, and some others. Also in those days there was I Love Lucy with some of Desi Arnaz' very hot bands on TV. I always loved what I perceived as its sophistication...The point of this post is world music and copyrightable intros in world music. I want to limit it to just three (3) examples, all of them from two (2) African nations - Zimbabwe and Cameroon.