The allegorical interpretation of the octoechos: William of Auxerre and the theology of Gregorian chant. In search of modal meaning as an expression of the Mystery

A brief and, I hope, exhaustive review of Claudio Campesato's fascinating work "Modal Allegory: The Allegorical Interpretation of the Octoechos as Liturgical-Musical Hermeneutics in William of Auxerre's 'Summa de officiis ecclesiasticis'"*. A liturgical-musical exploration of the theme of medieval allegory in relation to Gregorian modality.