I know that Bob Robb was likely on 'I Pity the Country ' by Dunn. Raven Polson is on 'Son of the Sun'.
I saw them both last year. We all got to play together a few years back on a Willie set near Brantford.
Other than Duke Redbird and Jerry Saddleback I'm not familiar with the other musicians. They seem to be mostly regional players from all over the map.
Kevin had quite a time tracking a lot of them down.