Ive never been a part of a choir.
Ah, i suppose most people haven't been a part of a musical ensemble of singers. 
yea they are popular at churches
. The former term is very often applied to groups affiliated with a church (whether or not they actually occupy the choir) and the second to groups that perform in theatres or concert halls, but this distinction is far from rigid. Choirs may sing without instrumental accompaniment, with the accompaniment of a piano or pipe organ, with a small ensemble (e.g., harpsichord, cello and double bass for a Baroque piece), or with a full orchestra of 70 to 100 musicians.
The term "Choir" has the
Young Voices Brandenburg
The Young Voices Brandenburg are a jazz and popular music choir of over 20 voices, composed of 18 to 26-year-old male and female singers. The musical ensemble is specifically auditioned from the State of Brandenburg, Germany on a two-year rotation. They have toured the United States, China, and South Africa as well as having recorded numerous highly acclaimed CDs. The group has been featured with prominent media periodicals/broadcasts such as Der Tagesspiegel, Cue TV and RBB. 
The ensemble is conducted