Jamieson, Fausset & Brown, on Neh 11:22

“And the overseer of the Levites in Jerusalem, was Azzi the son of Bani, the son of Hasabia, the son of Mathania, the son of Micha. Of the sons of Asaph, were the singing men in the ministry of the house of God.”

“the sons of Asaph, the singers were over the business of the house of God--They were selected to take charge of providing those things which were required for the interior of the temple and its service, while to others was committed the care of the "outward business of the house of God" (Neh 11:16). This duty was very properly assigned to the sons of Asaph; for, though they were Levites, they did not repair in rotation to Jerusalem, as the other ministers of religion. Being permanent residents, and employed in duties which were comparatively light and easy, they were very competent to undertake this charge.”

Imported from an open dataset — not yet checked against the printed edition.