Master Class, the Tony-winning play by Terrence McNally, tells the story of the uncompromising opera diva Maria Callas as she delivers a life altering master class to students at an elite opera training program. Support American Theatre: a just and thriving theatre ecology begins with information for all. Please join us in this mission by joining TCG, which entitles you to copies of our quarterly print magazine and helps support a long legacy of quality nonprofit arts journalism.