fill the air with "Backstage Babble". Among the admirers is Eve, a young woman who says that she, alone and friendless in New York, has found solace in watching her hero, Margo, perform. As soon as Margo can be alone with Bill Sampson, her director and fiancé, she tries to convince him to stay with her and not go to Rome to direct a movie. Bill firmly but lovingly tells her goodbye ("Think How It's Gonna Be"). Margo dreads facing the opening night party alone, and, wanting to have a good time, she persuades, Duane, her gay hairdresser, to take her and Eve to a gay nightclub in Greenwich Village ("But Alive"). The lively evening ends back at Margo's apartment. Eve declares that it has been the best time she's ever had ("The Best Night of My Life"). Margo, seeing her 19-year-old self in one of her old movies on TV, senses the impact her increasing age will have on her career and sarcastically asks "Who's That Girl?". Four months later, Eve has become Margo's indispensable assistant, impressing Margo's close friends, including her producer, Howard Benedict. Howard takes Eve to a "gypsy" hangout. "Gypsy," Howard explains,"is the name dancers affectionately give themselves as they go camping from show to show." The "gypsies", led by one of their own, Bonnie, celebrate "the sound that says love" – "Applause". That night, at three a.m. after a phone call from Bill in Rome, Margo longingly wishes he would "Hurry Back". Bill arranges to hurry back two weeks later, but at Margo's welcome home party for him a misunderstanding leads to a disastrous evening ("Fasten Your Seat Belts"). Eve, as Margo's ever-present assistant, knows Margo's part in the play completely, and Eve contrives to get herself hired as Margo's understudy. Margo, feeling betrayed and threatened, faces Eve with an ironic "Welcome to the Theatre". Bill accuses her of being paranoid about Eve, and after a bitter fight, he says goodbye to Margo, ending his relationship with her. Margo is left alone on an empty stage. Act Two Margo is visiting her friends, playwright Buzz Richards and his wife Karen, in their Connecticut home. Karen, thinking Margo behaved unfairly to Eve, arranges for Margo to miss a performance by draining the car's gas tank so they cannot return to New York in time for the evening's performance. Stuck in the country for the night, they