sentence: Polyphonic music is always in several parts.
sentences_before: A group of singers who are all singing the tune together are singing in 'unison'. If they divide into soprano, alto, tenor and bass, they are singing in four parts. The sopranos may be singing the tune and the altos, tenors and basses are providing the harmony underneath.
concept_name: polyphonic music
headings: Part (music)
categories: Musical terminology