well, it's weird b/c some of ozo's 70s releases were on DJM -- who's biggest act was Elton John, but which also had on the roster Johnny Guitar Watson and Billy Frazier's "billy who," the latter of which is like the best down-tempo disco song ever
Sphinx and Mother Afrika appear to have been their own imprints, and then circa 1990 they have the Riot label, on which they are again the only act, now doing house plus reissues of the 70s material
my guess is that they're a black American band with some connection to jamaica or africa
but they might just as easily be a black british band???
the music, in any case, is top notch -- somewhere in the space between slow disco, reggae and soul -- w/ a female vocalist