Columbia subject headings:
Harp music--500-1400--History and criticism.
Music theory--History--500-1400.
Harvard subject headings:
Harp music--500-1400--History and criticism.
Music
Music theory--History--500-1400
Princeton subject headings:
Harp music--History and criticism.
Music theory--History--15th century.
Music theory--History--500-1400.