How did the flexible rhythm of plainchant support regional variation in performance?

The flexible rhythm of plainchant—often described as "free" or non-metrical—was a fundamental element that allowed for significant regional variation in performance. Because plainchant relied on an oral tradition rather than a rigid, all-encompassing system of musical notation, performers were not constrained by strictly defined durational patterns.1

This lack of prescriptive notation meant that the rhythmic framework was not fixed, allowing the music to adapt to local customs and performance practices. The rhythm of plainchant was inherently linked to the Latin tongue, drawing its vitality from the natural accentuation of the liturgical text and the dynamic quality of word grouping. Consequently, because the notation was noncommittal regarding specific durations, individual singers and regions could interpret the flow of the music with a degree of flexibility that supported local stylistic preferences. This inherent adaptability ensured that plainchant remained a living, evolving tradition rather than a static, uniform set of instructions.21