Martin Simpson wrote this one, and plays it beautifully:
Jacob Bronowski, via ZeFrank, and Warren Ellis too (a strange pair, perhaps, but the clip is all the more essential in light of their shared interest):
Black Bottom Strut:
(versions by Three Stripped Gears and New Lost City Ramblers have brightened my days for years. One of the highlights of MY musical life was playing it with Mike Seeger at his house. You might also enjoy this version
from Technologists Notes.)