Columbia subject headings:
Chapels (Music)--Russia--History.
Choirs (Music)--Russia--History.
Gregorian chants--Russia.
Harvard subject headings:
Pridvornai︠a︡ Imperatorskai︠a︡ pevcheskai︠a︡ kapella--History.
Princeton subject headings:
Chapels (Music)--Russia--History.
Choirs (Music)--Russia--History.
Gregorian chants--Russia.