Columbia subject headings:
Music--Manuscripts--Exhibitions.
Opera--Exhibitions.
Pierpont Morgan Library.
Harvard subject headings:
Manuscripts--New York (State)--New York--Exhibitions.
Music--Manuscripts--Exhibitions
Opera--Exhibitions.
Pierpont Morgan Library--Exhibitions.
Princeton subject headings:
Music--Manuscripts--Exhibitions.
Opera--Exhibitions.
Pierpont Morgan Library.