Nyanga a.k.a. Kinyanga is a Bantu language that seems to be of uncertain affiliation spoken near Virunga National Park, just southwest of where Nande is spoken and south of where Bhele is spoken. This is a song called "Baka Batembila" by a folk group called International Dieti Duma Zulu that performs songs in Nyanga:
https://www.youtube.com/watch?v=9XvqWbQg1eI