Columbia subject headings:
Afonso, Zeca, 1929-1987--Criticism and interpretation.
Political ballads and songs--Portugal--20th century--History and criticism.
Protest songs--Portugal--History and criticism.
Harvard subject headings:
Afonso, Zeca, 1929-1987--Criticism and interpretation.
Political ballads and songs--Portugal--20th century--History and criticism.
Protest songs--Portugal--History and criticism.
Princeton subject headings: