"The Tale of Mr. Morton", a Grammar Rock song — which teaches about subjects and predicates in sentences — about a man who falls for his female next door neighbor. When he's too shy and nervous to tell her how he feels, she takes the initiative.
The ending stanza for "Three Is a Magic Number": "And there were three in the family/ And that's a magic number..."
There's just something about "Electoral College" that's extremely heartwarming. It's the triumphant reunion of the Schoolhouse Rock crew.