Let me hold my hand up before you and let the palm of this hand represent man’s soul – the soul of man lifted up to commune with God in worship. Just as God saw the palm needed something else, and added the fingers to it, so God in the New Testament, seeing man’s condition, said, “Man’s soul as it reaches up to adore me and my son needs some avenues and I am going to point out what these are.” He did just this very simply and very clearly. Just as there are five fingers there, so in the New Testament the soul of man reaches up in worship and communion with God through five channels, (1) singing, (2) praying, (3) studying, (4) giving of means, and (5) partaking of the Lord’s Supper. All five of these are specified in the New Testament but these are the only five. And, I am sure we will say that as the One who made the palm best knew how to make the fingers, so the one who made man’s soul knew best the avenues which this soul needed to commune with God.
James Baird, “Why Do Churches of Christ Use Only Vocal Music?”, Oft-Asked Questions, p. 122 (Western Christian Foundation, Inc.; Wichita Falls, Texas)