1 Chronicles 25:1, 6-7

Moreover, David and the commanders of the army selected for the [temple] service some of the sons of Asaph, Heman, and Jeduthun, who were to prophesy with lyres, harps, and cymbals. The list of the musicians who performed their service was as follows

All these were under the direction of their father to sing in the house of the LORD, with cymbals, harps, and lyres, for the service of the house of God. Asaph, Jeduthun, and Heman were under the order and direction of the king. So their number [who led the remainder of the 4,000], with their relatives who were trained in singing to the LORD, all who were skillful, was 288. [1 Chr 23:5]