Columbia subject headings:
Harvard subject headings:
Composition (Music)--Mechanical aids
Kircher, Athanasius, 1602-1680. Musurgia universalis.
Llull, Ramon, 1232?-1316
Music--Mathematics
Princeton subject headings:
Composition (Music)--17th century--History.
Kircher, Athanasius, 1602-1680--Criticism and interpretation.
Kircher, Athanasius, 1602-1680. Musurgia universalis.
Music theory--History.