I wonder whether any folk music devotees can identify several figures in
the post-World War II short film *To Hear Your Banjo Play*.  The film can
be viewed on youtube at:

The figures whom I cannot identify are:

a) the singer of *What Wondrous Love* (starting at 6:21);

(b) the two instrumentalists with Pete Seeger at 12:40, and

(c) the square dance caller, probably a member of Margot Mayo’s American
Square Dance Group (starting at 12:50).

Also, was this made for the educational market?  Any details about the
production would be appreciated.

Best wishes,

Richard Markowitz