Charles H. Spurgeon on Psalms 92:3

We are not to conceive that God enjoyed the harp as feeling a delight like ourselves in mere melody of sounds; but the Jews, who were yet under age, were restricted to the use of such childish elements. The intention of them was to stimulate the worshippers, and stir them up more actively to the celebration of the praise of God with the heart. We are to remember that the worship of God was never understood to consist in such outward services, which were only necessary to help forward a people, as yet weak and rude in knowledge, in the spiritual worship of God. A difference is to be observed in this respect between his people under the Old and under the New Testament; for now that Christ has appeared, and the church has reached full age, it were only to bury the light of the Gospel, should we introduce the shadows of a departed dispensation. From this, it appears that the Papists, in employing instrumental music, cannot be said so much to imitate the practice of God's ancient people, as to ape it in a senseless and absurd manner, exhibiting a silly delight in that worship of the Old Testament which was figurative, and terminated with the gospel. —John Calvin.