'Choirs' in the Bible

I brought the leaders of Judah up on top of the wall, and I appointed two large choirs to give thanks. One was to proceed on the top of the wall southward toward the Dung Gate.

Then the two choirs that gave thanks took their stations in the temple of God. I did also, along with half the officials with me,

and also Maaseiah, Shemaiah, Eleazar, Uzzi, Jehohanan, Malkijah, Elam, and Ezer. The choirs sang loudly under the direction of Jezrahiah.