The Checkmates LTD.

1960s-1970s soul group originally from Fort Wayne, Indiana.
Discovered by Nancy Wilson, comprised of mixed black and white .

Their biggest hits are 1969's "Black Pearl", produced by Creedence Clearwater Revival's "Proud Mary".
Broke up in 1970 - reformed in 1974. In 1974 they starred in the blaxploitation movie "The Black Connection" (or "Run Nigger Run") with first leading role given to their, then, lead singer Bobby Stevens. Their "F.S.O." album is actually the soundtrack of this movie. Last recorded in 1977.