question about musical piece

Does anyone know the name of the musical piece that was playing when the young girl was nursing Yasumoto? In the scene, her back is turned to Yasumoto, who is himself trying to stay awake watching her. She is reading one of his books on anatomy and is continually nodding off. The whole scene is drawn out (in a good way) with this beautiful music playing all the while, and I'd just like to know that it is.

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