Quartet is comprised of the following plays: Actors, a loving father has a secret. A.I.D.S., a doctor bribes a dying man's lover. Dina and Alba, about two women who love one another and an older lover who reappears. Piggy Bank, a prostitute charms and dupes her clients. Quartet follows Theater for the New City's production last fall of Mario Fratti's Trio, three short plays about sex, religion and politics.