Columbia subject headings:
Communism.
Music--History and criticism.
Music--Philosophy and aesthetics.
Musicology--Congresses.
Musicology.
Socialism and music--Congresses.
Harvard subject headings:
Communism and music.
Music--History and criticism
Music--Philosophy and aesthetics
Socialism and music.
Princeton subject headings:
Musicology--Congresses.
Socialism and music--Congresses.