These are the men David put in charge of music in the Lord’s sanctuary, ¹  after the ark was placed there.

Heman and Jeduthun were in charge of the music, including the trumpets, cymbals, and the other musical instruments used in praising God. The sons of Jeduthun guarded the entrance. ¹ 

They and their relatives, all of them skilled and trained to make music to the Lord, numbered two hundred eighty-eight. ¹ 

while David and all Israel were energetically ¹  celebrating before God, singing and playing various stringed instruments, ²  tambourines, cymbals, and trumpets.

David told the leaders of the Levites to appoint some of their relatives as musicians; they were to play various instruments, including stringed instruments and cymbals, and to sing loudly and joyfully. ¹ 

They performed music ¹  before the sanctuary ²  of the meeting tent until Solomon built the Lord’s temple in Jerusalem. ³  They carried out their tasks according to regulations.

All of these were under the supervision of their fathers; they were musicians in the Lord’s temple, playing cymbals and stringed instruments as they served in God’s temple. Asaph, Jeduthun, and Heman were under the supervision of the king.