and with them Heman and Jeduthun [with] trumpets and cymbals for those that should sound aloud, and [with] instruments for the songs of God; and the sons of Jeduthun to be at the gate.
So glorious psalm of thanksgiving and praise that David gave. The first that was sung in the establishing of the worship for the children of Israel as once again they built the tabernacle, brought the ark of the covenant, and began to establish the worship of God once more as the heart of the nation. And so David then appointed Asaph and his brethren to minister before the ark continually, as every day's work required.