Among other things, it's amazing that Peggy Seeger's voice sounds so great--at age 79 or so.
Another role model.

Re: Foolin' Around Suite (1957)

It would take an awful lot of studious "foolin' around" to be able to do this:   

Part of Beethoven's 9th--the last movement "An die Freude", based on the Schiller poem: then a snatch of "Way Out There" ( in the first "movement". )   

Then the second "movement" with the Johann Schop hymn (words by Martin Jahn) which served as the source for what we think of as "Jesu, Joy of Man's Desiring"--Bach orchestrated it. And of course Pete throws in a snatch of the original Jahn text (auf Deutsch, sogar).

The the 3rd "movement" , the first theme from Beethoven's 7th, second movement. In the hands of a banjo master like Pete, it sounds amazingly like a gypsy song.