1 Chronicles 16:4-6, 37-42

Then he appointed some of the Levites as ministers before the ark of the LORD, to invoke, to thank, and to praise the LORD, the God of Israel. Asaph was the chief, and second to him were Zechariah, Jeiel, Shemiramoth, Jehiel, Mattithiah, Eliab, Benaiah, Obed-edom, and Jeiel, who were to play harps and lyres; Asaph was to sound the cymbals, and Benaiah and Jahaziel the priests were to blow trumpets regularly before the ark of the covenant of God.

So David left Asaph and his brothers there before the ark of the covenant of the LORD to minister regularly before the ark as each day required, and also Obed-edom and his sixty-eight brothers, while Obed-edom, the son of Jeduthun, and Hosah were to be gatekeepers. And he left Zadok the priest and his brothers the priests before the tabernacle of the LORD in the high place that was at Gibeon to offer burnt offerings to the LORD on the altar of burnt offering regularly morning and evening, to do all that is written in the Law of the LORD that he commanded Israel. With them were Heman and Jeduthun and the rest of those chosen and expressly named to give thanks to the LORD, for his steadfast love endures forever. Heman and Jeduthun had trumpets and cymbals for the music and instruments for sacred song. The sons of Jeduthun were appointed to the gate.