I have to say my love for folk music started with Tony Saletan in the early 60s. (I'm not sure if that's the way his name was spelled) who was with WGBH. He'd sing Pick a Bale of Cotton with his guitar and glasses. I loved his show when I was 4 and 5; picked up a record of his of Revolutionary Songs in the 70s.

I also remember the Gentle Giant and fell in love with Early One Morning... just played on the harp while the "giant" pulled out a tiny dollhouse chair and invited tykes like me to sit down. I don't remember anything about the show... but I LOVED that song.