Check out this band from the Southern sahara region called "Tinariwen." Their music is a combination of afro-pop and blues from the Mali region. Many of the songs are based on call and response where the lead singer sings out a phrase and then is echoed by a chorus of voices repeating the same line. Absolutely hypnotic, powerful music!! I wish I knew what they were saying, that would make it even more interesting for me. I'm not sure what language they speak, I think it's Algerian, but not 100% sure. Check it out!