These were the family leaders of the Levites, as listed in their genealogical records. They lived in Jerusalem.
TSK
TSK · 1 Chronicles 15:12
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David assembled all Israel at Jerusalem to bring the ark of the LORD up to the place he had prepared for it.
David Leads in Worship They brought the ark of God and put it in the middle of the tent David had pitched for it. Then they offered burnt sacrifices and peace offerings before God.
Solomon addressed all Israel, including those who commanded units of a thousand and a hundred, the judges, and all the leaders of all Israel who were heads of families.
Solomon Moves the Ark into the Temple Then Solomon convened Israel’s elders– all the leaders of the Israelite tribes and families– in Jerusalem, so they could witness the transferal of the ark of the covenant of the LORD from the City of David(that is, Zion).
He brought in the priests and Levites and assembled them in the square on the east side.
They slaughtered the Passover lamb on the fourteenth day of the second month. The priests and Levites were ashamed, so they consecrated themselves and brought burnt sacrifices to the LORD’s temple.
Leave! Leave! Get out of there! Don’t touch anything unclean! Get out of it! Stay pure, you who carry the LORD’s holy items!
Set them apart in the truth; your word is truth.
They were singing a new song:“You are worthy to take the scroll and to open its seals because you were killed, and at the cost of your own blood you have purchased for God persons from every tribe, language, people, and nation.