Here's why:
* Abstract nouns refer to ideas, qualities, concepts, or feelings that cannot be physically touched or seen.
* Concrete nouns refer to things that are tangible and can be perceived by the senses.
Comedy itself is a *genre* or *type* of entertainment, not a physical object. You can't hold "comedy" in your hand or see it with your eyes. You can only experience it through laughter, humor, and the performance of comedic acts.