Charles H. Spurgeon on Psalms 33:3

Sing unto him. I. Singing is the music of nature. The Scriptures tell us the mountains sing Isa 55:12; the valleys sing Ps 65:13; the trees of the wood sing 1Ch 16:33; nay, the air is the birds' music room, they chant their musical notes. II. Singing is the music of ordinances. Augustine reports of himself, that when he came to Milan and heard the people sing, he wept for joy in the church to hear that pleasing melody. And Beza confesses that at his first entrance into the congregation, and hearing them sing the ninety-first Psalm, he felt himself exceedingly comforted, and did retain the sound of it afterwards upon his heart. The Rabbins tell us that the Jews, after the feast of the Passover was celebrated, sang the hundred and eleventh and five following Psalms; and our Saviour and his apostles sang a hymn immediately after the blessed Supper. Mt 26:30. III. Singing is the music of saints. (1.) They have performed this duty in their greatest numbers. Ps 149:1-2. (2.) In their greatest straits. Isa 26:19. (3.) In their greatest flight. Isa 42:10-11. (4.) In their greatest deliverances. (5.) In their greatest plenties. Isa 65:14. In all these changes singing hath been their stated duty and delight. And indeed it is meet that the saints and servants of God should sing forth their joys and praises to the Lord Almighty: every attribute of him can set both their song and their tune. IV. Singing is the music of angels. Job tells us "the morning stars sang together, "Job 38:7. Now these "morning stars, "as Pineda tells us, are the angels; to which the Chaldee paraphrase accords, naming these morning stars, aciem angelorum, an host of angels. Nay, when this heavenly host was sent to proclaim the birth of our dearest Jesus, they deliver their message in this raised way of duty. Lu 2:13. They were (ainountev), delivering their messages in a laudatory singing, the whole company of angels making a musical quire. Nay, in heaven there is the angels' joyous music; they there sing hallelujahs to the Most High, and to the Lamb who sits upon the throne, Re 5:11. V. Singing is the music of heaven; the glorious saints and angels accent their praises this way, and make one harmony in their state of blessedness; and this is the music of the Bride chamber. The saints who were tuning here their Psalms, are now singing their hallelujahs in a louder strain, and articulating their joys, which here they could not express to their perfect satisfaction; here they laboured with drowsy hearts, and faltering tongues; but in glory these impediments are removed, and nothing is left to jar their joyful celebration. John Wells, in "Morning Exercises."