Not sure why this is in this thread as it seems OT to me. But this is a non-essential. You are free to worship without instruments if you feel convicted to do so. However Christians who use instruments in worship do not sin. That early Christians sang does not mean using instruments is sinful, esp if you use the Bible to interpret the Bible, since use of instruments is endorsed in many places elsewhere. This would be like saying since the resurrected Jesus asked for fish to eat, Christians should only eat fish for meat. That's a conclusion that does not follow. Again you are free to take this on, but other Christians are free not to do so.
Simply present the "authorization" in the N.T. by Book, Chapter and Verse that allows musical instruments in a worship service.
Most importantly, the Apostle was inspired by the Holy Spirit of God to make sure that everyone understood that they were not to go beyond WHAT IS WRITTEN in worshiping God. "Now these things, brethren, I have figuratively transferred to myself and Apollos for your sakes, that you may learn not to go beyond WHAT IS WRITTEN, THAT NONE OF YOU MAY BE PUFFED UP (Jealous) on behalf of one against another." -- 1 Cor. 4:6
There are no verses in the N.T. to indicate the use of musical instruments is authorized by God. Examine the passages from the N.T that defines "Christian Music". 1. Matthew 26:30, They sung a Hymn (also Mark 14:26) 2. Acts 16:25, Paul and Silas sang while in jail.
3. Romans, I will sing to YOUR NAME (Lord).
4. 1 Cor.14:15, I will sing with spirit and understanding (does everyone UNDERSTAND or even know the basics of playing a musical instrument? No.......by using musical instruments you are presenting nothing but an opportunity to cause division among the members of the church, presenting some to be more talented than others...etc., with the usual emotional side effect ending in Jealousy.)
5. Eph. 5:19, Sing and make melody to the Lord (again, you are worshiping God, God is not worshiping you.........in fact by presenting a thread such as this searching for ACCOLADE for your personal endeavors (even though you nor anyone else is Special in the eyes of the Lord, as God has no respect of person -- Rom. 12:11, is the perfect example of why God does not authorize the use of special instruments in worship services, everyone is supposed to in one voice present praise and worship to God.
6. Col. 3:16, sing with grace in your hearts.
7. Heb. 2:12, I will sing Christ's praise in the congregation
8. James 5:13, If you are cheerful, sing praise.
Some might attempt to use the Greek Translation found in Eph. 5:19 which translates Melody as a note from a musical instrument and/or a note from the heart. But logic dictates its from the heart otherwise it would be a sin NOT TO USE A MUSICAL INSURMENT while worshiping God (and as pointed out........some individuals are born tone death with no talent to even attempt to learn a musical instrument). The passage does not say use either or, both sing and melody are to be used. God would never make a command that would be impossible to obey.
By using musical instruments and Rock Music.........someone is teaching these children at a young and impressionable age that its better to strive to be SPECIAL in the eyes of the Lord....and the one's who cannot understand nor learn about musical instruments is a failure in the eyes of the Lord. If someone wants to enjoy rock music on a personal basis, outside of a worship service designed to teach Christian Truth.....enjoy yourself, as its up to you to work out your own salvation with fear and trembling. (Phil. 2:12)
God has "commanded" through the inspiration of the Holy Spirit, "Do not go beyond WHAT IS WRITTEN". (1 Cor. 4:6)This is perhaps why MANY MIGHT BE CALLED but FEW ARE CHOSEN (Matt. 22:14), a lack of studying the Word of God and rightly dividing the word of Truth (2 Tim. 2:15)