1 Chronicles 6:31

Now these are the singers, heads of fathers’ households of the Levites, who lived in the chambers of the temple free from other service; for they were over them in their work day and night.

So the builders laid the foundation of the temple of Yahweh. Then the priests stood in their apparel with trumpets, and the Levites, the sons of Asaph, with cymbals, to praise Yahweh according to the directions of King David of Israel.

From the outside to the inner gate were chambers for the singers in the inner court, one of which was at the side of the north gate, with its front toward the south, and one at the side of the south gate facing toward the north.