The original comparison concerning divorce, the Sabbath, and changed covenants
Claim examined: Worship, music, and prayer
Scriptural Answer
You said: Are you saying that God enjoyed instrumental worship in the OT, will enjoy it again in heaven, but for the church age, He despises it? My Reply: As for showing disapproval of instruments, where in the Scriptures do we see that God must show approval or disapproval of practices to make them right/wrong? We see in Matthew 19:7-8 that God allowed the Jews to divorce their wives, even though God hates divorce (Malachi 2:16). God disapproved of the practice, yet it was allowed. Furthermore, do we read anywhere of God showing disapproval of the Sabbath under the Law of Moses? By no means! Yet we do not observe the Sabbath today, not because God disapproves of it, but because the covenant has changed, and the Sabbath rest is now the hope laid up in Heaven (Hebrews 4). Likewise, God does not need to show that He disapproves of instrumental music for it to not be practiced by His children today. Every example of music practiced by Christians was vocal. (Matthew 26:30, Acts 16:25, Romans 15:9, I Corinthians 14:15, Hebrews 2:12) Every command concerning Christians and music was a command to practice vocal music instead of instrumental music. (Ephesians 5:19, Colossians 3:16) The only music commanded in the New Testament is vocal. It is a specific command, therefore it excludes all other kinds of music. No where in the New Testament does Christ, or an inspired man command the use of instruments of music. There is no command for its use in the church, there is no example of it being used by the church, there is no hint that it was used. If we truly love the Lord the positive command to sing would be sufficient to exclude instrumental music from the worship.
KJV Scriptures Used
Read each passage in its chapter and compare the Scriptures together.