If the new covenant has superceded the old covenant(which it has), and we have been given a specific command in the new covenant regarding praise in worship(which we have), then what authority do we have to add to the command given in the new covenant?
The very same authority by which you prohibit instruments in church, when in fact no New Covenant command prohibits the same. Unless you're careful, you could well fall afoul of the warnings in Colossians 2.
In point of fact, the New Testament is silent on the matter of instruments in church. Is it not better to simply speak where the bible speaks, and be silent where it is silent?
You know, those verses don't specifically state that it is acceptable to wear clothes while singing praises unto the Lord, either. I sincerely hope your congregation is not offending Him by singing while fully dressed.
Again, your terminology points to your seeming desire to throw out the OT in its entirety. Ephesians 5:19 and Colossians 3:16 have not replaced Psalms 149 and 150. Those epistles appear in the NT. They came under the new covenant.
The NT has not replaced the OT. The new covenant has replaced the old covenant. Surely you understand the distinction.
I am very interested to know where Scripture says otherwise.