The operatic diva Maria Callas lives on in Terrence McNally's Master Class. The setting is a opera workshop taught by the incomparable Maria Callas, which inevitably turns into a performance of the pieces Callas is most remembered for.

Maria Callas was true legend in opera and with an extremely versatile gift. She sang as a natural mezzo-soprano but through work and training, extended her range to include that of a soprano. The role, played by Celeste Roberts, gives a glimpse of Callas's unique talent and over-the-top personality.