All Israel brought up the ark of the Lord’s covenant; they were shouting, blowing trumpets, sounding cymbals, and playing stringed instruments.

All these were the sons of Heman, the king’s prophet. God had promised him these sons in order to make him prestigious. ¹  God gave Heman fourteen sons and three daughters.

and the priests Benaiah and Jahaziel were to blow trumpets regularly before the ark of God’s covenant.

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

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 

Shebaniah, Joshaphat, Nethanel, Amasai, Zechariah, Benaiah, and Eliezer the priests were to blow the trumpets before the ark of God; Obed-Edom and Jehiel were also guardians ¹  of the ark.