Columbia subject headings:
Music theory--Early works to 1800.
Music theory--History--500-1400.
Music--Terminology--Early works to 1800.
Music--Terminology.
Harvard subject headings:
Music theory--Early works to 1800.
Music theory--History--15th century.
Music theory--History--500-1400.
Music--Terminology
Music--Terminology--Early works to 1800.
Princeton subject headings:
Music theory--History--15th century.
Music theory--History--500-1400.
Music--Terminology.