Columbia subject headings:
Composers--Recruiting--Italy--History--18th century.
King's Theatre (London, England)
Opera--England--London--Sources.
Opera--England--London.
Singers--Recruiting--Italy--History--18th century.
Harvard subject headings:
Composers--Italy--Recruiting--History--18th century.
Impresarios--England--London--18th century.
Kings Theatre (London, England)
Opera--England--London--18th century--Sources.
Opera--England--London--18th century.
Opera--Italy--18th century
Singers--Italy--Recruiting--History--18th century.
Princeton subject headings:
Composers--Italy--Recruiting--History--18th century.
King's Theatre (London, England)
Opera--England--London--18th century--Sources.
Opera--England--London--18th century.
Singers--Italy--Recruiting--History--18th century.