Are musical instruments forbidden in the NT Church as the Church of Christ claims?
King James Version (KJV)
16 Let the word of Christ dwell in you richly in all wisdom; teaching and admonishing one another in psalms and hymns and spiritual songs, singing with grace in your hearts to the Lord.
Clearly they are not forbidden as Paul tells/commands us to sing Psalms, and many of the Psalms require/command instruments to be used.
Some extra scripture.
Is any among you afflicted? let him pray. Is any merry? let him sing psalms – James 5:13.