Ya know, I doubt it made the top 100, but I actually heard pete Seeger and fred hellerman singing "Precious friend" (Pete wrote it) several times on CHUM am. here in Toronto....and don't forget (or should that be 'fergit') Billy Edd's "Little Brown Shack". Jest a country boy and his D-28.
You SHOULD check out Justa's link about Zager....it's quite funny.
Rick