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Banjo-player and singer Derroll Adams appears in
Dont Look Back. He and Jack Elliott made some records together in the mid-50s in London (and Italy), and Bob enthused about them in the film.
This set in from 1991 in East Germany, and Jack joins Derroll at about the 26-minute mark for a couple of duets:
https://www.youtube.com/watch?v=6_3My23MouI