 It has been argued that the motet presents homographic tenors and is therefore not an isorhythmic motet as often presented, since there are no isorhythms in its compositional proceedings .Regardless, the motet is striking for its synthesis of the older isorhythmic style and the new contrapuntal style that Dufay himself would explore further in the coming decades, as would successors such as Ockeghem and Josquin des Prez.The title of the piece stems from the name of the cathedral itself