1950s
Wings Over Jordan Choir singing "Rock My Soul In the Bosom of Abraham"
Pete Seeger recording of "Mary Don't You Weep"

1960s
Judy Collins and whales recording of "Farewell to Tarwaithe"
Phil Ochs recording "Crucifixion"
John Denver doing "Bells of Rhymney" live at a Mitchell Trio concert
original version of "Sounds of Silence"

1970s
Doc Watson live in concert
Stan Rogers in general and "Northwest Passage" in particular

1990s
Tamarack recording of "Frobisher Bay"
Garnet Rogers doing "Night Drive" solo in concert

2000s
Tom Russell's recording of "Blood Oranges" I was stunned in the sense that it gave me the shivers and totally creeped me out.