The Phantom obliges by appearing as a ghostly, partially masked face in her mirror ("The Mirror/Angel of Music (Reprise)"). Believing him to be the Angel of Music sent by her deceased father, Christine is irresistibly drawn through the mirror to the Phantom, who leads her down into the cellars of the Opéra house. The two then board a small boat and cross a subterranean lake to his secret lair ("The Phantom of the Opera"). The Phantom explains that he has chosen Christine to sing his music and serenades her. When he reveals a mirror that reflects an image of her in a wedding dress, the figure in the mirror gestures to Christine and she faints from shock. The Phantom then covers her tenderly with his cloak and puts her on a bed ("The Music of the Night"). As the Phantom is composing music at his organ, Christine awakens to the sound of the monkey music box ("I Remember"). Overcome with curiosity, she slips behind the Phantom, lifts his mask, and beholds his grotesquely disfigured face. The Phantom rails at her prying gesture and Christine runs in fear. He then ruefully expresses his longing to be loved ("Stranger Than You Dreamt It"). Moved by pity, Christine returns the mask to the Phantom and he escorts her back above ground. Meanwhile, Joseph Buquet, the Opéra's chief stagehand, regales the chorus girls with tales of the "Opéra Ghost" and his terrible Punjab lasso. Madame Giry arrives and warns Buquet to exercise restraint or face the Phantom's wrath ("Magical Lasso"). In the managers' office, André and Firman read notes from the Phantom and are interrupted by Raoul, who accuses them of sending him a note saying that he should make no attempt to see Christine again. Carlotta and Piangi then burst in, demanding to know who sent Carlotta a note warning that her "days at the Opéra Populaire are numbered." As André and Firmin try to calm Carlotta, Madame Giry delivers another note from the Phantom: he demands that Christine replace Carlotta as the Countess in the new opera, "Il Muto," and that Box 5 be kept empty for him. The managers are warned they will face a "disaster beyond imagination" if these demands are not met ("Notes"). Firmin and André assure the furious Carlotta that she will remain their star and Christine will play the Pageboy, a silent role ("Prima Donna").