John Gill Commentary 1 Chronicles 25:6

"All these were under the hands of their father for song in the house of Jehovah, with cymbals, psalteries, and harps, for the service of the house of God; Asaph, Jeduthun, and Heman being under the order of the king." — 1 Chronicles 25:6 (ASV)

All these were under the hands of their father, for song in the
house of the Lord
Instructed and directed by him in the performance of the service in the temple: with cymbals, psalteries, and harps, for the service of the house of
God ;
Instructed and directed by him in the performance of the service in the temple: with cymbals, psalteries, and harps, for the service of the house of
God ;
which were the three principal instruments of music used in the temple service: according to the king's order, to Asaph, Jeduthun, and Heman ;
who ordered and directed them what to sing, what tunes to make use of, and what instruments to play upon to those tunes.