So, with the foundation of the temple of the Lord laid by the masons, etc., great devotion of all persons is shown. With the foundation of the temple of the Lord laid, both priests and Levites and all the people, according to their respective statuses, praised the mercy of the Lord. The priests, indeed, adorned with holy garments as they were accustomed while the temple still stood, sounding the trumpets and stirring the hearts of the people to the sweetness of the heavenly praise; the Levites, strumming well on cymbals, singing hymns to the Lord; and the people, exhibiting their hearts' affection in common clamor in praising the Lord. The Levites also praised the Lord by the hand of David, either on the instruments which he made or the psalms which he established, or because David, in the placing of the ark, appointed Asaph and his brethren to give thanks to the Lord, as the words of the days testify, concerning whom it is again said: "Because his sons were under his hand, prophesying according to the king." (1 Chronicles VI). Rightly, also in this place, when the sons of Asaph praised and gave thanks to the Lord by the hand of David, that is, they are to be understood to have done this according to his arrangement. According to the mystical sense, indeed, with the temple of the Lord founded by masons, the priests stand in their attire with trumpets, when converted sinners from the error of sins, and with faith and love of Christ established in their hearts, all who hear the masters of the churches rejoice. They themselves, moreover, decorating themselves more diligently with good works, sound the trumpets of saving doctrine, so that both by the example of virtues and by the exhortation of sermons, they might aid the good beginnings of those who either recently by repenting have come to the grace of Christ or have recently taught others to turn to the grace of Christ. The Levites also stand to praise God with cymbals when even ministers of the second order serve their Creator with pious deeds for the instruction of neophytes, and this in the mutual sweetness of charity. For cymbals, which strike each other to sound, most fittingly express the works of charity, with which the holy ones excite each other to the praise of their author. They also praise Him through the hand of David, the King of Israel, when they diligently consider and strive as much as they can to imitate the works that the Lord and Savior carried out in the flesh.
Source: Commentary on Ezra and Nehemiah