Polyphony, the simultaneous combination of two

Position 1: Consequently, the foundations laid by medieval polyphonists made possible the rich harmonic language that defines classical and contemporary Western composition.

Position 2: Before its widespread adoption, composers relied almost exclusively on monophonic plainchant, in which a single melody was sung without harmonic support.

Position 3: These innovations eventually codified into strict counterpoint rules, which governed how melodic lines could interact without producing dissonant clashes.

Position 4: Polyphony, the simultaneous combination of two or more independent melodic lines, fundamentally transformed Western music during the medieval period.

Position 5: As polyphonic techniques evolved through the work of composers at Notre Dame Cathedral, musicians began layering voices in increasingly complex arrangements.