Columbia subject headings:
Choruses, Sacred (Mixed voices), Unaccompanied.
Choruses, Secular (Mixed voices), Unaccompanied.
Harvard subject headings:
Choruses, Sacred (Mixed voices), Unaccompanied.
Choruses, Secular (Mixed voices), Unaccompanied.
Princeton subject headings:
Choruses, Sacred (Mixed voices), Unaccompanied.
Choruses, Secular (Mixed voices), Unaccompanied.
Gregory, Narekatzi, Saint, 951-1003--Musical settings.