1957 – 1961 Intermittent brief periods of fieldwork among some fifty different Congo populations, including Zande, Agbarambo, Mangbetu, Malele, Mangbele, Mayogo, Meegye, Mamvu, Bwa, Yew, Mabinza (Ngombe), Mongelima (Baboro), Bira, Lese, Talinga, Mbuba, Lendu, Aluur, Leka, Pere, Komo, Havu, Nande, Tembo, Hunde, Vira, Fuliro (Fulero), Shi, Luba-Kasai, Kongo-Bavungani, Kongo-Ntandu, Teke-Mfinu, Wuum, Mongo (Ekota and Bakutu), Yeke, Sanga. This fieldwork was sponsored by the Land Tenure Commission for the Congo, and some by Lovanium University (Kinshasa) and Liège University (Belgium).
1954 – 1957 Nyanga people (Walikale zone, eastern Congo montane rain forest) including also research among the Baremba (Pygmies), Baasa and Batiri (Komo-related) and some Hunde-related groups. Sponsored by IRSAC, Brussels.
1952 – 1953, 1955, 1957 Lega people (Mwenga, Shabunda, Pangi zones, South Kivu and Manyema districts In Kivu Province, eastern Congo rain forest) including short periods of research among the Nyindu, Mbote, Vira, Furiiru, Basikasingo, Konjo, Leka, Batali (Binja), Kwame, Kanu, Binja, Boyo. Sponsored by IRSAC, Brussels.
1949 – 1952 Zyoba people (heterogeneous groups of Pygmy, Luba, Hemba, Lunda and uncertain origins who are riverains on the Western shores of Lake Tanganyika) and Bembe people (Fizi and Mwenga zones, South-Kivu district in the Kivu Province, eastern Congo highlands). Sponsored by IRSAC, Brussels.
1950 – 1953 Lega bwami initiation songs and music of the nsinga and the sacred-secret instruments of the bwali circumcision rites
1954 – 1958
Nyanga recordings of various instruments, and texts
In the course of land tenure studies (August – December): Nande (Lubero) , Pere (Lubero),Talinga (Beni), Ruwenzori area, Mbuti (Beni), Bwisha (Rutshuru), Tembo (Kalehe), Komo (Lubutu), Leka (Lubutu), Bira and Mputi (Mambasa), Lese (Mambasa), Aluur, Logo, Zande (Dungu)
- Copies of these recordings are at the Musée royal de l’Afrique centrale, Tervuren