Taylor's Kentucky Boys were multiracial in their membership which appears to have been more common in Appalachia at that time but still quite rare. Their fiddle player was named Jim Booker, who I've read did not appear in the only known photograph of the band. Grey Eagle (1927)
Mack Woolbright was a blind three finger style banjo player that a six year old Earl Scruggs heard play in 1930. Here is Woolbright playing with Charlie Parker (not the Saxophone great). Will, The Weaver (1927)
Hobart Smith, although he played in the claw hammer banjo style was another early artist,along with his perhaps more successful vocalist sister Texas Gladden who had been singing in the now familiar "high lonesome" style since the 1920's. Though very hard to find, she did some recording in the 1930's, here she is at age 46 with Poor Ellen Smith (1941). Give it a listen and if see if you are like me...this sounds a lot like the Bluegrass 'reportedly' started in 1945.
Nitty Gritty Dirt Band with a cover of Stuck in the Middle with You. Here is a link to a YoutubePickin' On Series with a number of great covers from different genre. A sampling of them Rocket Man, All About the Bass, Jolene.