A music school is an institution where music is taught to a high standard, sometimes with other standard subjects taught as secondary (such as at the Yehudi Menuhin School.) Often music schools are dedicated to the perfection of an instrument or voice, but musical theory can also be taught.
... later that evening, Kitty rejects him in the expectation that Vronsky is about to propose to her.
The following morning Stiva and Vronsky are at the station to welcome ...