glee club

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A group of singers who perform usually short pieces of choral music.

from The Century Dictionary.

• noun A company of singers organized to sing glees, part-songs, and the like, often of male voices only.

from the GNU version of the Collaborative International Dictionary of English.

• A club or company organized for singing glees, and (by extension) part songs, ballads, etc.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun US A high school choir

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a club organized to sing together