Aeschylus's Agamemnon is a tragedy because it is a play focused on the downfall of a great man, who in this case is none other than Agamemnon himself (big surprise). At the same time, however, it makes sense to think of this play in terms of the more modern genre of "Horror." This isn't only because, even by the standards of tragedy, it is unusually gruesome. Agamemnon also fits into the horror category because of the agonizingly slow increase of dread as the play continues, especially after the carpet scene and when Cassandra starts having her horrible visions. In a way, Clytemnestra is the original horror villain.