Columbia subject headings:
Microtones.
Music--Europe--19th century--History and criticism.
Music--Europe--20th century--History and criticism.
Harvard subject headings:
Microtones.
Music--Europe--19th century--History and criticism
Music--Europe--20th century--History and criticism
Princeton subject headings:
Microtones.
Music--Europe--19th century--History and criticism.
Music--Europe--20th century--History and criticism.