Columbia subject headings:
Authorship--Collaboration--Congresses.
Brecht, Bertolt, 1898-1956--Authorship--Collaboration--Congresses.
Brecht, Bertolt, 1898-1956--Knowledge and learning.
Eisler, Hanns, 1898-1962--Congresses.
Songs and music.
Weill, Kurt, 1900-1950--Congresses.
Harvard subject headings:
Brecht, Bertolt, 1898-1956--Congresses.
Brecht, Bertolt, 1898-1956--Musical settings--History and criticism.
Eisler, Hanns, 1898-1962--Congresses.
Music and literature.
Princeton subject headings:
Authorship--Collaboration--Congresses.
Brecht, Bertolt, 1898-1956--Authorship--Collaboration--Congresses.
Brecht, Bertolt, 1898-1956--Knowledge--Music.
Eisler, Hanns, 1898-1962--Congresses.
Weill, Kurt, 1900-1950--Congresses.