“And he set the Levites in the house of the LORD with cymbals, with psalteries, and with harps, according to the commandment of David, and of Gad the king's seer, and Nathan the prophet: for so was the commandment of the LORD by his prophets.”
King James Version (KJV)
29:23 They laid - The king and the elders of the congregation in the name of the whole congregation.
29:27 The song - The psalms composed by David and Asaph. Even sorrow for sin must not put us out of tune for praising God. By faith we must even then rejoice in the Lord our righteousness, and our prayers and praises must attend with his offering, to be accepted only in the virtue of it.