I´m listening to a CD published by the National Geographic Society that contains a wide sample of South African music (traditional and modern), and it´s great!; I bought it a couple days ago out of curiosity and I´m very impressed by it; even my coworkers liked it, so it has to be good. 
Three thumbs up, look for it if you ever had the most remote interest on the genre.
Is it part of a series, or just a one-off?
It´s a series, it came with a little leaflet listing the other CDs. The bonus material included this link, there are a few samples there.