It may seem counter-intuitive, but the history of world music proves that unfamiliar instruments and rhythms cross borders much more readily than vocal styles. There's no question that, starting in the late '60s, soul and then funk became very popular in sub-Saharan Africa. Decades of reissues show that a lot of players found their way into electric guitar, and that enriching the big beat of the West was a cinch for African percussionists.
Before Led Zeppelin, there was Iron Butterfly — these days, a very misremembered band from Los Angeles. Maybe it was the movie industry all around, but '60s garage-rock in L.A. had an expansive, almost cinematic streak. Iron Butterfly was not the most inventive band on that scene, but it became the most famous because of a single, durable, out-of-nowhere hit, "In-A-Gadda-Da-Vida." The song was 17 minutes long, and the proper thing to do on underground radio stations was the play the whole thing.