David and the army officers selected some of the sons of Asaph, Heman, and Jeduthun to prophesy as they played stringed instruments and cymbals. ¹  The following men were assigned this responsibility: ² 

The sons of Amram: Aaron and Moses. Aaron and his descendants were chosen on a permanent basis to consecrate the most holy items, to offer sacrifices before the Lord, to serve him, and to praise his name. ¹ 

David divided them into groups corresponding to the sons of Levi: Gershon, Kohath, and Merari.

David, Zadok (a descendant of Eleazar), and Ahimelech (a descendant of Ithamar) divided them into groups to carry out their assigned responsibilities. ¹ 

Some of the Gadites joined David at the stronghold in the desert. They were warriors who were trained for battle; they carried shields and spears. They were as fierce as lions and could run as quickly as gazelles across the hills. ¹