I was having a conversation at work where the subject of the Schoolhouse rock videos came up, and we were trying to describe them to an Indian colleague. It was remarkable that pretty much all of the Americans knew them, even though some of the people are quite young. And we could still sing some of the songs. That impressed her to look them up on YouTube for her own kids.
They really were great. They made an impression without your even realizing it at the time. I listen back now and I realize how clever they were.