Folkways are going to release an album with Doc Watson and Gaither Carlton: https://folkways.si.edu/doc-watson-and-gaither-carlton .
The recordings are from 1962 and Peter K. Siegel (BHO member!) made the recordings during two concerts in Greenwich Village 1962.
'Singing...' 2 hrs
'Good Friday Morning' 3 hrs
'Freda' 3 hrs
'Prucha Old Tyme' 6 hrs