The Ngombi is an eight-string harp
The Mongongo is a musical bow with oral resonator
 
Mongongo, Gildas "Mokuku", Aug. 2005, 1'47
Mongongo, Gildas "Mokuku", Aug. 2005, 1'55
Mongongo, Gildas "Mokuku", Aug. 2005, 2'28
Mongongo, Gildas "Mokuku", Aug. 2005, 2'29
Ngombi, unknown artist, 31'50                          
Ngombi (part 2), 32'02