Well, Lang spanned both the world of orchestral dance music (Paul Whiteman, Jean Goldkette, etc.) with small group work with Joe Venuti, Bix Beiderbecke, Adrian Rollini and others. I have no idea what Willie Johnson would have heard on the radio.

As to Western Swing, a study of my extensive collection of Bob Wills recordings reveals that there were a whole range of styles bundled together - not only in the repertoire, but in individual songs. One piece might start off with a traditional country sound - fiddles, etc., - then break into swing with a sax section, then hot jazz with trumpet and guitar solos! Certainly guitarist Eldon Shamblin played all this stuff - but I think he adapted his style to suit the recording.