Choirs are interesting.  They are also known as a quire, chorale, or chorus.
Are you talking about the groups with a large amount of people singing different tones and ranges to make a song?
Yes indeed.  They may perform music from a classical music repertoire.
Oh wow.  What's your favorite classical song?
I have a few, and seeing choirs being led by conductors is an amazing scene.
My favorite classical songs have to be anything by Bach
Bach is a classic.  Born July 28, 1750.
My birthday month is also July.  I also enjoy Meredith Monk
Meredith Monk
Meredith Jane Monk (born November 20, 1942) is an American composer, performer, director, vocalist, filmmaker, and choreographer. Since the 1960s, Monk has created multi-disciplinary works which combine music, theatre, and dance, recording extensively for ECM Records. In 1991, Monk composed an opera called "Atlas" with the Houston Opera"."
Her music has been used in films by the Coen Brothers ("The Big Lebowski", 1998) and Jean-Luc Godard (
Choir
A choir (; also known as a quire, chorale or chorus) is a musical ensemble of singers. Choral music, in turn, is the music written specifically for such an ensemble to perform. Choirs may perform music from the classical music repertoire, which spans from the medieval era to the present, or popular music repertoire. Most choirs are led by a conductor, who leads the performances with arm and face gestures.
A body of singers who perform together as a group is called a choir or chorus