Heman and Jeduthun had with them trumpets and cymbals for the music and instruments for the songs of God. And the sons of Jeduthun were stationed at the gate.
The worship of God is not only to be the work of a solemn day now and then, brought in to grace a triumph; but it ought to be the work of every day. David therefore settles it here for a constancy, puts it into a method, which he obliged those that officiated to observe in their respective posts.
Commenting on 1 Chronicles 16:37-43
HIS PSALM OF THANKSGIVING. (1Ch. 16:7-43) Then on that day David delivered first this psalm--Among the other preparations for this solemn inauguration, the royal bard had composed a special hymn for the occasion. Doubtless it had been previously in the hands of Asaph and his assistants, but it was now publicly committed to them as they entered for the first time on the performance of their sacred duties.
Commenting on 1 Chronicles 16:7-43
Musical instruments of God - Ad canendum Deo, "to sing to God." - Vulgate. Των ωδων του Θεου, "of the sons of God." - Septuagint. The Syriac is remarkable: "These were upright men who did not sing unto God with instruments of music, nor with drums, nor with listra, nor with straight nor crooked pipes, nor with cymbals; but they sang before the Lord Almighty...