I saw the Schoolhouse Rock shorts many times while watching Saturday morning cartoons during my childhood. The tunes are still familiar these many years later. "A Noun is a Person, Place, or Thing" was created in 1973 (the year Mr. Gacek was born). In 1973, for some reason, abstract nouns were not included in the basic definition of noun.
And, for the record, this is Chubby Checker.