Columbia subject headings:
Music and language.
Music--500-1400--History and criticism.
Mysticism and literature.
Mysticism in music.
Mysticism--History--Middle Ages, 600-1500.
Harvard subject headings:
Music and language
Music--500-1400--History and criticism.
Music--Religious aspects--Christianity
Mysticism and literature
Mysticism in music
Mysticism--History--Middle Ages, 600-1500.
Princeton subject headings:
Music and language.
Music--500-1400--History and criticism.
Mysticism and literature.
Mysticism in music.
Mysticism--History--Middle Ages, 600-1500.