Isorhythm (from the Greek for "the same rhythm") is a musical technique that arranges a fixed pattern of pitches with a repeating rhythmic pattern.
Church Modes Oblique Motion Rhythmic Modes Isorhythm
During the Renaissance, polyphony emerged as the dominant compositional technique, characterized by the simultaneous combination of multiple independent melodies. This marked a significant shift from the earlier monophonic plainchant and monody styles, allowing for greater complexity and richness in musical texture. Isorhythm, while used, was less prevalent compared to the widespread adoption of polyphonic techniques in vocal music, particularly in sacred compositions.
The isorhythmic motet is a piece of the ars nova that employs isorhtyhm, which uses lengthy passages in identical rhythms and distinct melodie. Isorhythm reveals the culminations of ars nova (1300-1400) musical ingenuity. The repeating rhythm provided unification of pieces, replacing the unification formerly brought by the droning Gregorian chant during Medieval times/ars antiqua (1100-1250).