Columbia subject headings:
Harvard subject headings:
Ballads, Spanish--History and criticism--Congresses.
Music and literature--Congresses.
Music--Spain--History and criticism--Congresses.
Spanish poetry--Classical period, 1500-1700--History and criticism--Congresses.
Spanish poetry--To 1500--History and criticism--Congresses.
Princeton subject headings:
Music and literature--Congresses.
Music--Spain--16th century--History and criticism--Congresses.
Music--Spain--500-1400--History and criticism--Congresses.