Columbia subject headings:
Harvard subject headings:
Johán, de Cangas--Criticism and interpretation.
Johán, de Cangas.
Music theory--500 to 1400.
Music--Spain--Galicia (Region)--500 to 1400--History and criticism.
Portuguese poetry--To 1500--Sources.
Troubadours--Spain--Galicia (Region)
Princeton subject headings:
Johán, de Cangas--Criticism and interpretation.
Portuguese poetry--To 1500.
Troubadours--Spain--Galicia (Region).