Wallaschek's 1893 account of Khoikhoi music in SW Africa ("Hottentot")
"The Hottentots are great whistlers, and for this purpose they draw their lips to one side and whistle between their teeth. Burchell asserts that dance music is the most congenial to the Hottentots, " at least among all the musicians who were at different times in his service, none ever played any other kind, nor did Burchell ever hear a Hottentot performing a slow air, or singing to his own performance ". Many of the natives cannot discriminate between a regular tune and a mere noise, and Burchell's flute had no effect whatever upon them."
Richard Wallaschek, Primitive Music (1893)