Act II. Part I. Three years have elapsed. It is a long time since Pinkerton has left Butterfly with the promise to return to her "when the robins nest." When the curtain rises, after an introduction, in which another Japanese theme is employed, Suzuki, although convinced that Pinkerton has deserted her mistress, is praying for his return. Butterfly is full of faith and trust. In chiding her devoted maid for doubting that Pinkerton will return, she draws in language and song a vivid picture of his home-coming and of their mutual joy therein:—"Un bel dì vedremo" (Some day he'll come).
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In point of fact, Pinkerton really is returning to Nagasaki, but with no idea of resuming relations with his Japanese wife. Indeed, before leaving America he has written to Sharpless asking him to let Butterfly know that he is married to an American wife, who will join him in Nagasaki. Sharpless calls upon Butterfly, and attempts to deliver his message, but is unable to do so because of the emotions aroused in Butterfly by the very sight of a letter from Pinkerton. It throws her into a transport of joy because, unable immediately to grasp its contents, she believes that in writing he has remembered her, and must be returning to her. Sharpless endeavours to make the true situation clear to her, but is interrupted by a visit from Yamadori, a wealthy Japanese suitor, whom Goro urges Butterfly to marry. For the money left by Pinkerton with his little Japanese wife has dwindled almost to nothing, and poverty stares her in the face. But she will not hear of an alliance with Yamadori. She protests that she is already married to Pinkerton, and will await his return.
When Yamadori has gone, Sharpless makes one more effort to open her eyes to the truth. They have a duet, "Ora a noi" (Now at last), in which he again produces the letter, and attempts to persuade her that Pinkerton has been faithless to her and has forgotten her. Her only reply is to fetch in her baby boy, born since Pinkerton's departure. Her argument is, that when the boy's father hears what a fine son is waiting for him in Japan, he will hasten back. She sings to Trouble, as the little boy is called:—"Sai cos'ebbe cuore" (Do you hear, my sweet one, what that bad man is saying). Sharpless makes a final effort to disillusion her, but in vain. If Pinkerton does not come back, there are two things, she says, she can do—return to her old life and sing for people, or die. She sings a touching little lullaby to her baby boy, Suzuki twice interrupting her with the pathetically voiced exclamation, "Poor Madam Butterfly!"
A salute of cannon from the harbour announces the arrival of a man-of-war. Looking through the telescope, Butterfly and Suzuki discover that it is Pinkerton's ship, the "Abraham Lincoln." Now Butterfly is convinced that Sharpless is wrong. Her faith is about to be rewarded. The man she loves is returning to her. The home must be decorated and made cheerful and attractive to greet him. She and Suzuki distribute cherry blossoms wherever their effect will be most charming. The music accompanying this is the enchanting duet of the flowers, "Scuoti quella fronda di ciliegio" (Shake that cherry tree till every flower). Most effective is the phrase, "Gettiamo a mani piene mammole e tuberose" (In handfuls let us scatter violets and white roses.)
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Butterfly adorns herself and the baby boy. Then with her fingers she pierces three holes in the paper wall of the dwelling. She, Suzuki, and the baby peer through these, watching for Pinkerton's arrival. Night falls. Suzuki and the boy drop off to sleep. Butterfly rigid, motionless, waits and watches, her faith still unshaken, for the return of the man who has forsaken her. The pathos of the scene is profound; the music, with the hum of voices, borne upon the night from the distant harbour, exquisite.
Act II. Part II. When the curtain rises, night has passed, dawn is breaking. Suzuki and the baby are fast asleep, but Butterfly still is watching. Again Puccini employs a Japanese melody (the "vigil" theme).