Is he looking for only piano? Or maybe he plays another orchestra or band instrument?
I believe most of the ivies do, but Brown in particular has a great orchestra and it’s in a city with some green on its campus.
Many of the LACS have good to excellent music programs. Check out Williams and Amherst (not in cities, although Amherst has a town) and Vassar (next to a small city) in particular.
These are all reaches, of course.
The change in the Oberlin program sounds very promising for those who don’t want to be conservatory students but who want more access to the conservatory.