Hebrews 10:16-17 KJV
This is the covenant that I will make with them after those days, saith the Lord, I will put my laws into their hearts, and in their minds will I write them; [17] And their sins and iniquities will I remember no more.
Which laws do you allow God to write on your heart?
The Church of Christ denomination says it is a command to sing and to sing a capella. As God loveth a cheerful giver, He surely appreciates the cheerful singer. Musical instruments? Psalm 150. Maybe God enjoys a capella, but I don’t think it’s a matter of righteousness, it’s more a matter of your lack of understanding. It is in my opinion a tradition of man, an idea of early Church of Christ preachers.
The Church of Christ spends hours out of every year claiming holiness in a capella, yet the COC denomination cannot read and understand 1 Corinthians 14:34-38. It is clearly a New Testament command and one that no churches keep. If you are ignorant of these verses, skip them, but read on.
Neither can the Church of Christ denomination comprehend all of the Ten Commandments. They do not keep the Sabbath, nor believe it should be kept. 9 out of 10? Maybe. I would argue it’s a slippery slope. All ten are incorporated into the New Testament.
So what part of the Law of Jesus is in your heart and on your mind?
I believe what you let the Lord write there, he will also help you to keep. Discernment is a gift of God.
Saltwaterheart 
A cappella singing did not originate with the Church of Christ in the United States. Greek Orthodox Churches (who have many more members) always sang that way, as have some Mennonite churches, Presbyterian, and Primitive Baptists.
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My article is based on my own experience in the Church of Christ denomination. I never claimed it originated there. Musical instruments and the use of them praising God can be traced to the early church. Exodus 15:20. Plus there is no New Testament commandment forbidding it.
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Additionally I think a Capella is a beautiful and acceptable way to worship the Lord. The problem comes when people think a Capella is a matter of righteousness and refuse musical instruments as acceptable before the Lord.
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