Devola, I thought. Popola hung out in the library. But yeah, it was a nice touch, as were the various environmental songs that changed tone when shades were around. Organic, unobtrusive way of shifting background music.
This is correct.
And yeah, NIER used its music well. And had awesome music on top of that.
Speaking of which:
Freesscape - A sign of affection
Same vocalist as NIER. Amazing album (called Now is the point at which I touch eternity).