What is isorhythmic overlap in music?

Isorhythmic overlap in music refers to a compositional technique where rhythmic patterns are repeated independently of the melodic structure, creating a layered effect. This concept is often found in medieval and Renaissance music, particularly in motets, where the rhythm of the tenor part is distinct from that of the upper voices. The overlapping rhythms can create complex textures, enhancing the overall musical experience by juxtaposing different rhythmic cycles. This technique allows for both unity and diversity within a piece, contributing to its richness.