Here is a rare occasion for me to share information on a bluegrass band that has an African American Member. It is The Reunion Band out of Boston. Here is the info from their home page reunionbluegrass.com. Their "token" African American member in Richard Brown who plays mandolin.
Known for its tight vocal harmonies and solid traditional bluegrass sound, the Reunion Band features veteran Boston-area musicians Richard Brown (mandolin), Dave Dillon (rhythm guitar), Margaret Gerteis (acoustic bass), Laura Orshaw (fiddle) and most recently BB Bowness (banjo) . The band, which has been around since 2002, takes its name from the fact that its members have played together off and on and in various configurations for over 30 years.