Columbia subject headings:
Choruses (Mixed voices), Unaccompanied--20th century.
Harvard subject headings:
Choruses (Mixed voices), Unaccompanied--20th century.
Princeton subject headings:
Choruses (Mixed voices), Unaccompanied--20th century.
Choruses, Sacred (Mixed voices), Unaccompanied.
Choruses, Secular (Mixed voices), Unaccompanied.