If you’re preaching to the THIS, expect a LOT of ‘amens’ - sung!

noun

1. An organized company of singers (as in a church service)

   "greeted by a large male choir wearing red bowties and singing carols"

2. A group of instruments of the same class

   "a brass choir"

3. An organized group of persons or things

   "… travels with a suite of assistants and a choir of publicists."

4. A division of angels
5. The part of a church occupied by the singers or by the clergy
6. A group organized for ensemble speaking

verb

1. To sing or sound in chorus or concert

   "The woodwinds choired eloquently."

noun

1. A collection of 24 or sometimes 25 sheets of paper of the same size and quality one twentieth of a ream

noun

1. A gallery occupied by a church choir

idiom

1. To speak for or against something to people who already agree with one's opinions

   "The speeches he makes to his supporters won't win him any more votes. He's just preaching to the choir."