Columbia subject headings:
Harvard subject headings:
Art and music--Exhibitions.
Mechanical musical instruments--Exhibitions.
Mechanical musical instruments.
Music--20th century--History and criticism
Music--20th century--History and criticism--Exhibitions.
Musique concrète--History and criticism--Exhibitions.
Musique concrète--History and criticism.
Sound sculpture--Exhibitions.
Princeton subject headings:
Mechanical musical instruments.
Music--20th century--History and criticism.
Musique concrète--History and criticism.