The Khwe man Martin Ndumba plays the ǀaá-ǁhàvà (braced, vessel-resonated musical bow) and sings two farewell songs for Köhler (second song from 00:13:10) with subsequent exchange of farewell words between Martin Ndumba and Oswin Köhler in Khwe Oswin Köhler was one of the most important German Africanists of the second generation. He headed the Institute of African Studies at the University of Cologne from 1957 until his retirement in 1977. He studied many African languages from the Khoisan, Bantu, Gur and Nilotic language groups or families. His academic legacy is currently kept in the Oswin Köhler Archive at the Institute of African Studies of the Goethe University Frankfurt. Martin Ndumba was Oswin Köhler's consultant between 1959 and 1965; Khwe chief; father of Nǁgo Ndumba