Mbay a.k.a. Sara Mbay is yet another Bongo-Bagirmi language spoken in the Central African Republic as well as Chad. This is a song called "Kag Ndil" performed many years ago by the late artist Aldo from a Chadian band called Chari Jazz. I'm not 100% sure what language it's in, but based on the title and a bit of searching on Google, I think it might be in Mbay: https://www.youtube.com/watch?v=FxrgiFDiXRo
Sar, a.k.a. Sara, Madjingay, or Sara Madjingay is one of the East Sara languages spoken in Chad, closely related to Mbay. This is a song in one of the Sara languages and I think possibly in Sar. It's being performed by a (I guess Christian, given their clothing?) choir: https://www.youtube.com/watch?v=SXf_3H3shPU
Naba is a variety of Bagirmi spoken in southern Chad, with more speakers than any other variety (including the standard Barma variety, which appears to be spoken rather far away and much closer to the Cameroonian border than Naba is). This is a song that I think is or at least may be in Naba: https://www.youtube.com/watch?v=8EREC_5Bh8A
Kenga is another variety of the Bagirmi language, geographically separated from Naba (which is spoken to the north) by two other varieties of Bagirmi called Jaya and Morom. This is a song in Kenga called "Genamgué" performed by a choir led by someone named Abtouyour. Apparently, it's about the importance of not being judgmental: https://www.youtube.com/watch?v=gjGnJeGS8u8
Migaama a.k.a. Migama, Jongor, Djonkor, Dionkor, Dyongor, and Djonkor About Telfane is an East Chadic language spoken in central Chad but not especially closely related to the other East Chadian languages I've posted songs in so far. This is a traditional song in Migaama accompanied by a harp; sorry for the poor audio quality, especially of the vocals: https://www.youtube.com/watch?v=zpdiqiCywmk
(Even though this differs from the varieties of Nynorsk spoken in Western Norway, I guess it is still closer to Nynorsk than it is to Bokmål, thinking of words like fauk, ikkje, nokken etc; correct me if I'm wrong, though.)
Didje Manyam is apparently a variety of Sara Kaba Naa, a Bongo-Bagirmi language spoken in Chad and the Central African Republic. This is a GRN recording with a song apparently in Didje Manyam beginning at 3:48 and ending at 8:04.
I don't know which language this song is in apart from the fact that it has a little bit of French in it. I don't even remember which language I thought it might be in, but I guess one possibility is that I thought it was in a language called Laka or Kabba Laka. Laka is a Sara language closely related to Ngambay. This video was apparently recorded on Christmas Eve 2012 for Chadian TV to display it online, but the song itself dates from the 80s IIUC. It's called "Maïmouna," and the singer's name is Frederick Samara: https://www.youtube.com/watch?v=nRR7ROo2Q6Q
Ewondo is a Bantu language of the Beti group spoken in and around Yaoundé, the capital of Cameroon. This song, "Zangalewa," is in a combination of Ewondo and Camfranglais (a pidgin based on both English and French spoken in Cameroon). "Waka waka" is a ripoff of this song (specifically, the part starting around 7:30 in this video): https://www.youtube.com/watch?v=czaRA68QkT8
In addition to Nigeria and Niger, Hausa is also spoken in a few other West African countries, including Cameroon. It's especially widely spoken as a trade language. Wikipedia says that the varieties "spoken in various parts of Cameroon and Chad...combined the mixed dialects of northern Nigeria and Niger" and have been more heavily influenced by Arabic. Anyway, this is a Hausa song from Cameroon: https://www.youtube.com/watch?v=ELe2I2FyaGk
Dagba is an East Sara language closely related to Sar and Mbay; however, unlike these other two (and probably its other closest relatives, Ngam, Gulay, and Horo), Dagba is not spoken by as many people in Chad as next door in the Central African Republic (CAR). This is a song in Dagba by Idylle Mamba called "Gadji Koyo." It's from the CAR. The lyrics are available in the video description: https://www.youtube.com/watch?v=dAkrPHqoCIA