Plural of diaphony; multiple instances or examples of the musical technique where different melodies are played simultaneously.
From diaphony (Greek dia- + phone), with the standard English plural -ies ending replacing the singular -y, following patterns seen in words like 'symphony' → 'symphonies'.
The plural form shows how medieval and Renaissance composers experimented with layering multiple melodies—creating 'diaphonies' was essentially the birth of Western harmony as we know it today.
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