The Motet

The two pieces for Monday are examples of the isorhythmic motet, a specialized type of music that was saved for special occassions. In the isorhythmic motet, there is often a proportional relationship in the length/speed/duration of the individual sections of the work to each other. That is, Section A may be twice as long as Section B (2:1) or one and a half times as long as Section B (3:2) etc. The article by Charles Warren tries to read something into the proportions of the DuFay motet. This was a very controversial argument when it was put forth and was rebutted in two other articles: one by Craig Wright, an expert on Early Music at Yale, and more recently by Marvin Trachtenberg, an architecture professor at NYU, among others. So:
1) What about Warren's article?
2) Consider the motet in light of Notker's insertion of words into a chant.