Some reviewers believe he pulled out some of his Puccini magic, wrapping meaning and melody around to create a strange synthesis between the kind gentle slave-girl Liú, who gave her life for love, and the princess Turandot who has been up to this moment executing would-be suitors right and left. But any such legerdemain took place after Puccini's sudden and untimely death; he left this his last opera uncompleted.
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Here's all the opera quotes in Part I of my current draft. (In Part III someone will give partial translations in English, and also utter the words, "Nessun dorma.")
...“La tua pronuncia è unica…” he started. Then he beamed, operatically. “La donna è mobile,” he said instead. “Muta d'accento!”
“Tu pure, o Principessa,” Giulio said, sounding like he was flirting with me. “Nella tua fredda stanza, guardi le stelle.”
For a moment his expression was serious. “Vissi d’arte,” he told me softly.
Rigoletto and Tosca are in the Public Domain and are quite safe. And, as is the nature of opera arias, the public name is the same as the first line of "Vissi d'arte," "La donna é mobile," and "Nessun dorma."
The most-quoted part of "Nessun dorma" is the second stanza, containing "il nome mio nessun saprà!" Which I will not quote in the novel, nor will I use any of the popular English translations. My in-universe excuse is that Penny has found the only street singer in Venice who doesn't know much English. At the moment I'm considering having him conflate with a later verse and say something like, "No-one but you shall know my name."
I actually look forward to taking flack for an "incorrect" translation. That means that a fellow opera buff will have read the thing. Well, doesn't take that much of a buff; it's probably the most famous opera aria in the world. All three are way, way up there; they are the kind of excerpts people would recognize, from art dealers to gondoliers to, well, many of my readers.
It is there because it advances the plot and supports the theme, because playing with language and the embedded meaning in artworks are both part of the process of problem and solution, the conflict if you will. And because it falls within the class of material which can achieve "pleased recognition."
This is true across all sorts of fiction. It isn't just a trivia game the reader is playing for points. Say you are doing a story set in the 40's and you mention "In the Mood" is playing on the radio. Most readers who have chosen to read a story set in the 40's will recognize the name and remember the song. They will run the gamut, of course, from just starting to learn about the period and struggling to remember key details, to being extremely familiar with the period and wishing the author had made a less obvious choice. But for all there will be that moment of recognition, of knowing the reader and writer are on the same page, sharing and communicating a similar understanding of the material.
You would expect a globe-trotting story to expect you to have heard of Venice and know it has canals and gondoliers. And that you are going to see people saying "hello" in German. And set in Athens, someone is going to bring up the Persian War, Greek gods, Homer, and Ouzo. And you expect to learn a few things you didn't know before, but also be presented with things you are happy to recognize.
And I'd venture there will be quite a few people waiting for Penny to finally share in their knowledge. In the scene above, she immediately recognizes something is up, but it isn't until Venice that the shoe finishes dropping.