1977. The Electric Company.

This was my jam. I couldn't wait for Sesame Street to be over and the Electric Company to start. I liked the silhouettes that talked to each other. I IMDB'd the Electric Company and found out that Morgan Freeman played Count Dracula/Easy Reader/Mad Scientist/Marcello/Mark/Mel Mounds/The Cop on 780 episodes. Perhaps that's why I find his voice so pleasant. Or it could be that he just has a really great voice.