This came to me when someone commented on the lack of action: with so many moments of Aomame waiting in her apartment for Tengo, I couldn't help thinking of Madame Butterfly, even though that is admittedly a very different situation dramatically. Tengo is hardly a Pinkerton character. However, I do feel that this plot would lend itself well to a 3 act opera. There are relatively few key turning points in the plot, which lends itself well to the operatic structure, which has to keep the number of scenes to a reasonable minimum. The number of characters is not large, and you have the opportunity to create dramatic foils as well as the obligatory "villain's aria". The ending, of course, could not be more operatic. I also think that the personalities of the two main protagonists, Aomame and Tengo, would benefit from the addition of a musical context, since with music you can express so much that cannot be articulated in dialogue. There is a real intensity of emotion to their interior lives that could be brought out with music. I have to admit I had this idea when I was only halfway through the book, and envisioning the book this way in my mind helped me to enjoy the book even more, because, like opera, there are certain conceits for which you simply have to suspend disbelief and accept. (view spoiler)[The lovers separated in childhood and remaining apart for decades, but ultimately destined for each other (hide spoiler)] is a kind of cliche; the sort of thing you have to accept all the time to appreciate opera.
I think the score to a 1Q84 opera would need atonality and dissonance with a little bit of romanticism. A (dead) composer that comes to mind is Alban Berg.
I have to admit I had this idea when I was only halfway through the book, and envisioning the book this way in my mind helped me to enjoy the book even more, because, like opera, there are certain conceits for which you simply have to suspend disbelief and accept. (view spoiler)[The lovers separated in childhood and remaining apart for decades, but ultimately destined for each other (hide spoiler)] is a kind of cliche; the sort of thing you have to accept all the time to appreciate opera.