Princeton said:
Grungetta is one of my favorite overlooked obscure characters. She was Oscar's girlfriend and she had a very casual way of dressing. A lot of details are escaping me right now; the only thing I can really remember that she sang was "The Everything's In The Wrong Place Ball". Was she in anything else that noteworthy?
On the "Sesame Road" cassette/CD, her song is "Grouch Girls Don't Want to Have Fun." Oscar sings in the background - off key, of course.
Which reminds me....
Both Oscar and Grungetta have something called "The Off-Key Song", as entitled on Shalom Sesame, though most people who've heard it would call it "We Are A Couple of Grouches". I don't know which is the official title, but you get the idea.