Columbia subject headings:
Music theory--History--15th century.
Musical intervals and scales--Early works to 1800.
Harvard subject headings:
Counterpoint--15th century.
Music theory--History--15th century.
Musical intervals and scales--Early works to 1800.
Princeton subject headings:
Counterpoint--Early works to 1800.
Music theory--History--15th century.
Musical intervals and scales--Early works to 1800.