What a thought provoking question. Since The Recording Academy (the Grammy folks) categorize the indigenous Zydeco music of the black and multiracial French speaking Creoles of Louisiana as Traditional and Contemporary Folk then there are oodles more black folk artists. However not since Tracy Chapman won one in 1988 or Ladysmith Black Mambazo 1987 has any black folk singer/artist ever garnered a Grammy. We are working to establish a separate Grammy category for this indigenous genre of music. Corey Harris is another example of an artist who is versed in many forms of roots/folk music.