Charles H. Spurgeon on Psalms 71:22

Psaltery... harp. Suppose singing with instruments were not typical, but only an external solemnity of worship, fitted to the solace of the outward senses of children under age, such as the Israelites were in the Old Testament (Ga 4:1-3); yet now, in the grown age of the heirs of the New Testament, such external pompous solemnities are ceased, and no external worship reserved, but such as holdeth forth simplicity and gravity; nor is any voice now to be heard in the church of Christ, but such as is significant and edifying by signification (1Co 14:10-11,26), which the voice of instruments is not. John Cotton, 1585-1652.