There are black musicians on both sides of the "hardcore bluegrass divide". There are folks like Sparky and Rhonda Rucker doing pre-bluegrass Appalachian-oriented folk music. And there are guys like Bela Fleck's bandmates Victor Wooten and Future Man on the progressive, newgrass end. It seems to be just straight-ahead bluegrass that isn't attracting much in the way of black participation. Ya don't suppose the confederate flags that seem to festoon every tenth campsite at a typical bluegrass festival has anything to do with it, do ya?