SonnyMax who's obviously a better researcher than I am pm'd me the following:
From what I could find, MOMA and TCM issued a restored version of the film in 1998 on videotape. This was the occasion for which a “percussive score [was] added”. Interestingly, I also found this in the NYT, dated February 4, 2001: “On Saturday February 10 at 2 p.m., the Newark Museum will screen one of Micheaux's silent films, ''The Symbol of the Unconquered'' (1920). The drummer Max Roach will provide the percussive accompaniment to the film he performed once before on television.”