an artistic form of auditory communication incorporating instrumental or vocal tones in a structured and continuous manner

a musical form involving the simultaneous sound of two or more melodies

independent variation on a single melody by two or more voices.

the technique, found in some medieval English music, of singing voice parts in parallel thirds.

early polyphony of the late Middle Ages that consists of one or more voice parts accompanying the cantus firmus often in parallel motion at a fourth, fifth, or octave above or below.