Great Mark, I finally get to say "not quite!" David Rea was from Ohio, but we made him an honorary Canadian when he played Merle Travis' "Blue Smoke". I know the answer to Sandy's question so I won't spoil it, but here's one: Gordon Lightfoot and Jim Croce shared a VERY eccentric bass player, name him.
Oh, and one more. Maybe a little tricky. On her very first recording, who was Joan Baez' sideman? Even more tricky, who was Sandy Paton's on his first? Got those? Well then Here's the capper. I'll be surprised if anyone gets this. Who was Bob Gibson's guitarist on "Ski Songs"?

As nobody's ventured a guess on the folk singer with the bell shaped guitar, the answer is : Carl Sandburg. Too obscure? I'm sorry. Oh and the Limelighters' banjoist was Alex Hassilev.