Although a tiny minority of classical musicians even today are of African descent, there have been many outstanding musicians over the centuries.
Le Mozart Noir: Compact Disc 18099
Six String Quartets, opus 1: Compact Disc 8553
Violin Concerto in A Major, op. 5, no. 2: Compact Disc 4910
Performance parts for his violin concertos and two symphonies: M2 .M2584 v. 3
His biography: Joseph Boulogne, called Chevalier Saint-Georges by Emil F. Smidak:
DC 137.5 .S35 S56 1996
Article (with list of works and bibliography) in Grove Music via Oxford Music Online.