Polyphonic (Polyphony, Counterpoint, Contrapuntal) - If more than one independent melody is occurring at the same time.
Heterophonic - There’s only one melody but different variations of it are being sung or played at the same time.
Solo - A single performer or a passage that is to be performed by a single performer.
Soli - A directive to perform an indicated passage of a composition with an entire section of an ensemble.
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