Columbia subject headings:
Epic poetry--History and criticism--Congresses.
Folk songs--History and criticism--Congresses.
Harvard subject headings:
Ballads--Congresses.
Ballads--History and criticism--Congresses.
Epic poetry--Congresses.
Epic poetry--History and criticism--Congresses.
Epic poetry--Performance.
Ethnomusicology--Congresses.
Music and literature--Congresses.
Music--500-1400--History and criticism
Princeton subject headings:
Epic poetry--History and criticism--Congresses.
Folk songs--History and criticism--Congresses.