I had no idea. But I challenge anyone to find a performance by white musicians that featured the equivalent of Louis, Gregory (a fascinating speaker--I heard him in college in the late 60's), and Baldwin.

Here's an interesting integration (that I discovered in researching early NW Ga music). The white string band Georgia Yellow Hammers integrated (briefly in 1927) for a 78 record with Andrew Baxter (fiddle) and Jim Baxter (guitar). Here's the highlight (and imo one of the great string band performances from anyone / anywhere / any time), "G Rag." The fiddling is especially spirited.

https://youtu.be/TV57ZMG8I-0?si=u_cwZwqUNcuur37v

The Baxter brothers (from Calhoun GA https://en.wikipedia.org/wiki/Andrew_and_Jim_Baxter ) released a number of songs on their own. The Baxters were often popular at white barn dances that were de facto (if not de jure) segregated.