Columbia subject headings:
Gregorian chants--Instruction and study.
Music theory--Early works to 1800.
Sight-singing--Early works to 1800.
Harvard subject headings:
Gregorian chants--Instruction and study.
Music theory--History--17th century--Early works to 1800.
Music theory--History--17th century.
Sight-singing--Early works to 1800.
Princeton subject headings: