Upper-Voice Structures and Compositional Process in the Ars Nova Motet

In the motets of Philippe de Vitry, Guillaume de Machaut, and their contemporaries, tenors have often been characterized as the primary shaping forces, prior in conception as well as in construction to the upper voices. Tenors are shaped by the interaction of talea and color, medieval terms now used to refer to the independent repetition of rhythms and pitches, respectively. The presence in the upper voices of the periodically repeating rhythmic patterns, often referred to as "isorhythm," has be