What style would this 1940 recording be?

The player on this acetate recording, made about 1940 in Sheridan, Michigan, accompanies a fiddler playing a medley of "Rakes of Mallow" and other tunes.

I don't know anything more about the players, other than they were elderly at the time.  Another one they recorded was "Preacher and the Bear," so I suspect he had done some minstrel show stuff. 

Go to http://www.giffordmusic.net/Old%20Standards.html  and click on 4.a., right after "Rakes of Mallow."

I suppose it's "up picking," but any similar comparisons would be interesting.  There isn't much rural Northern 5-string banjo recorded.

Paul Gifford