
der Chor
choir
A group of people who sing together.
Meine Tochter singt im Schulchor.
My daughter sings in the school choir.
choir
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choir
A group of people who sing together.
Meine Tochter singt im Schulchor.
My daughter sings in the school choir.

chorus
A piece of music composed for a singing group.
Zum Abschluss des Konzerts sangen alle gemeinsam einen Chor von Händel.
At the end of the concert, everyone sang a chorus by Handel together.

choir
The area in a church reserved for the altar and the clergy, where the choir often sings.
Die alten Buntglasfenster im Chor der Kathedrale sind besonders beeindruckend.
The old stained-glass windows in the choir of the cathedral are especially impressive.
You can recognize the meaning of 'Chor' (choir/chorus) from the verb: 'im Chor singen' (to sing in a choir) refers to the group, 'einen Chor singen' (to sing a chorus) refers to the piece of music, and 'im Chor stehen' (to stand in the choir) refers to the part of the church.
Er singt seit fünf Jahren im Kirchenchor.
He has been singing in the church choir for five years.
'Chor' (choir) is a common component of compound nouns that describe the type of singing group more precisely. This makes it easy to recognize what kind of choir it is.
Der Kinderchor hat morgen seinen großen Auftritt.
The children's choir has its big performance tomorrow.
The most common and important combination is 'im Chor singen' (to sing in a choir). The preposition 'in' with the dative expresses belonging to the group.
Singen Sie gerne? Dann kommen Sie doch in unseren Chor!
Do you like singing? Then come join our choir!
choral
As a noun, der Chor can refer to a piece of music for a singing group. Choral, on the other hand, is an adjective and describes music that is related to a choir or arranged in multiple parts for singing voices.

Das Finale des Werks ist ein Chor für vier Stimmen.
The work's finale is a chorus for four voices.
Das Finale des Werks ist choral für vier Stimmen gesetzt.
The work's finale is set chorally for four voices.