Columbia subject headings:
Frondoni, Angelo, 1808 or 1809-1891--Criticism and interpretation--Congresses.
Music--Portugal--19th century--History and criticism--Congresses.
Musical theater--Portugal--History--19th century--Congresses.
Harvard subject headings:
Frondoni, Angelo, 1808 or 1809-1891--Criticism and interpretation--Congresses.
Music--Portugal--19th century--History and criticism--Congresses.
Musical theater--Portugal--History--19th century--Congresses.
Princeton subject headings:
Frondoni, Angelo, 1808 or 1809-1891--Criticism and intepretation--Congresses.
Music--Portugal--19th century--History and criticism--Congresses.
Musical theater--Portugal--History--19th century--Congresses.