Shelvin Rock played with fiddle, guitar, and foot.
This is an A modal tune. That means key of A (with chords A and E7 as expected) plus a G chord. The first part goes back and forth between A and G major chords. The second part has only A and E7 chords. There is one extra measure of A chord between parts 1 and 2, and that makes this tune crooked and confusing at first.
Bruce Molskey and Rafe Stephanini at Clifftop [tube]
John Hartford recorded a nice version [Amazon clip].
A jam video. Nice music but tough sound quality. [toob and right]
Stage performance by Mariel Vandersteel, Lukas Pool, Louis Fram & Stash Wyslouch [tube].