noun
choral piece; chorus (musical work)
Refers to a musical composition written for a choir to perform. Not to be confused with the refrain of a song (which is also 'chorus' in English).
合唱コンクールのために新しい合唱曲を練習している。
We are practicing a new choral piece for the choir competition.
この合唱
This choral piece is sung in four-part harmony.