Columbia subject headings:
Music--Bibliography.
Music--Bio-bibliography.
Music--Dictionaries.
Operas--Stories, plots, etc.
Harvard subject headings:
Music--Bibliography
Music--Bio-bibliography
Music--Dictionaries
Musicians--Bio-bibliography
Operas--Stories, plots, etc.
Princeton subject headings:
Dictionaries.
Music--Bibliography.
Music--Bio-bibliography.
Music--Dictionaries.
Operas--Stories, plots, etc.