Khoisan languages

Khoisan is a family of languages (27 according to Ethnologue):
http://www.ethnologue.com/show_family.asp?subid=90321

Most Khoisan languages are endangered, and several are moribund or extinct. Most have no written record. The only widespread Khoisan language is Nama of Namibia
http://en.wikipedia.org/wiki/Khoisan_languages

STREAMABLE ARTISTS
Brenda Fassie
Johnny Clegg and Savuka
Judith Sephuma
Ladysmith Black Mambazo
Mahotella Queens
Miriam Makeba
Oliver Mtukudzi
Sibongile Khumalo
Simphiwe Dana
Thomas Mapfumo
Zola

If you know the exact language(s) used by one of the above artist please answer to this thread

Do you know an artist that should be in this list? Please answer to the thread.