Judy Collins guest stars on the Muppet Show from 1977. Here is this intro, and Judy singing "Leatherwing Bat."
WOW Oki it sounds weird because I was trying not to laugh through most of it ^_^
29.8.2014 - Léto v Centru (Brno) Dejá vu Brno Leatherwing Bat (Peter, Paul and Mary) www.deja-vu.cz.
Characters are from Homestuck, song is Leatherwing Bat by Peter Paul and Mary.