This film used to play occasionally on daytime TV when I was a child. I must have seen it at least three times. Made by the same team (Gordon and Fleischer) that brought us "Gulliver's Travels", it's a charming little movie with a plot very similar to the later Pixar film "A Bug's Life." I remember first learning the name Hoagy Carmichael when I read the credits as an eight-year-old (my mother was astonished to know that I had heard of him.) If "Hoppitty" were ever released on DVD I would buy it in a heartbeat. I don't know anyone else who has ever seen it, though, which necessarily limits the amount of outcry over this deep injustice to a great little movie.
Review of Mr. Bug Goes to Town
