Under the hands. i.e. under his direction, as 1Ch_25:2.
According to the king’s order to Asaph, Jeduthun, and Heman, Heb. by the hands of the king, and of Asaph, Jeduthun, and Heman, i.e. according to the king’s appointment, and under the conduct of Asaph, Jeduthun, and Heman.