Columbia subject headings:
English drama--18th century--History and criticism--Congresses.
Music in the theater--Congresses.
Theater--England--London--History--Congresses.
Harvard subject headings:
English drama--18th century--History and criticism--Congresses.
Music in the theater--Congresses.
Theater--England--London--History--Congresses.
Princeton subject headings:
English drama--18th century--History and criticism--Congresses.
Music in the theater--Congresses.
Theater--England--London--History--Congresses.