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I was trying to make a point that the old covenant is no longer in effect.

Right ... we no longer keep any Law ... for we are saved, strictly, by Grace.
Ephesians 2:8 For by grace are you saved, through faith, ... and that not of yourselves. It is the gift of God, not of works, lest any man should boast.
And the basis for this new Convenant we are a part of ... is Love.
1 Corinthians 13:8 Love never fails. But whether there are prophecies, they will fail; whether there are tongues, they will cease; whether there is knowledge, it will vanish away.

9 For we know in part and we prophesy in part.

...

12 For now we see in a mirror, dimly, but then face to face. Now I know in part, but then I shall know just as I also am known.

13 And now abide faith, hope, love, these three; but the greatest of these is love.

So, then, Paul tells us to avoid getting all hung up on ... what some think that we, as christians, should or should not do.

In the very book and chapter you most recently cited (Galatians 5) ... Paul warns us not to get all bound up in anything that hinders our liberty in Christ.
Galatians 5:1 Stand fast therefore in the liberty wherewith Christ hath made us free, and be not entangled again with the yoke of bondage.

...

13 For, brethren, ye have been called unto liberty; only use not liberty for an occasion to the flesh, but by love serve one another.

14 For all the law is fulfilled in one word, even in this; Thou shalt love thy neighbour as thyself.
For this reason, we (as christians) are cautioned against judgemental toward our fellow christians ... over minute differences in belief and practice.

For Christ has given us the liberty to not be bound by such unbending law (or belief)
Romans 14:2 For one believeth that he may eat all things: another, who is weak, eateth herbs.

3 Let not him that eateth despise him that eateth not; and let not him which eateth not judge him that eateth: for God hath received him.

4 Who art thou that judgest another man's servant? to his own master he standeth or falleth. Yea, he shall be holden up: for God is able to make him stand.

5 One person esteems one day above another; another esteems every day alike. Let each be fully convinced in his own mind.

6 He who observes the day, observes it to the Lord; and he who does not observe the day, to the Lord he does not observe it.

He who eats, eats to the Lord, for he gives God thanks; and he who does not eat, to the Lord he does not eat, and gives God thanks.

7 For none of us lives to himself, and no one dies to himself.

8 For if we live, we live to the Lord; and if we die, we die to the Lord. Therefore, whether we live or die, we are the Lord's.
Now ... no doubt you will say that you do not believe that the issue of instrumental music in christian worship is the same sort of issue that Paul discusses above ... but I believe that it is.