'part music' definitions:

Definition of 'part music'

(from WordNet)

noun

Vocal music for several voices in independent parts (usually performed without accompaniment)

Synonyms of 'part music'

From: Moby Thesaurus

duet,
duettino,
duo,
ensemble music,
ensemble singing,
octet,
part singing,
part song,
polyphonic music,
quartet,
quintet,
septet,
septuor,
sestet,
sextet,
terzet,
terzetto,
trio

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