I've been forced into a kind of strange position by the current U.S. copyright law, in that I could get into legal trouble if any eager-beaver attorney thinks that I might have violated it. This law can always be changed arbitrarily, as it's been changed that way so many times before, but never mind that. Most of these ancient 78-rpm records aren't worth legally pursuing over copyrights (even the heirs' children are probably long dead), but if I'm wrong about this, I'm screwed.
However, being "stuck" (heh heh) with the American musical period of roughly 1925-1935 reveals a great variety of musical riches. Vaudeville, Ragtime, Yiddish music, Harlem Jazz, Boogie-Woogie— who knows where it all came from? And where it all went? Some of it went, right here: