The business intended was probably the internal business, as distinct from the “outward business” Nehemiah 11:16 : a part of which was the apportionment of the royal bounty among the members of the choir Nehemiah 11:23.
Related Commentaries of Nehemiah 11:22
Nehemiah 11:22
22 The overseer also of the Levites at Jerusalem was Uzzi the son of Bani, the son of Hashabiah, the son of Mattaniah, the son of Micha. Of the sons of Asaph, the singers were over the business of the house of God.