Toon Rock: I'm an Amendment-to-be (The Simpsons, 1996)

From season 7 of The Simpsons:

As part of an episode detailing the origins of the show-within-a-show, The Itchy & Scratchy Show, the writers came up with a parody of a Schoolhouse Rock! classic.

Jack Sheldon, who sang "I'm Just a Bill" nearly 25 years earlier, returns for "I'm an Amendment-to-be".