Seriously, if you were trying to put me to sleep with this, then you literally almost succeeded.
Are you finished making things up yet?
You are the one who needs to prove that music was limited to the law, and you have not even come close to doing so. The things under the law which have become obsolete were shadows or foreshadowings of things that would come under the New Testament. Go ahead. Here is your big chance. Show us where musical instruments under the Old Testament were but shadows of better things to come. You will never be able to do so, so stop deluding yourself into believing otherwise. You are certainly not fooling me.
By the way, the law was not given until the children of Israel came near Mt. Sinai, and this happened prior to the giving of the law.
Exo 15:20
And Miriam the prophetess, the sister of Aaron, took a timbrel in her hand; and all the women went out after her with timbrels and with dances.
Exo 15:21
And Miriam answered them, Sing ye to the LORD, for he hath triumphed gloriously; the horse and his rider hath he thrown into the sea.
Prior to the law, the children of Israel worshipped the LORD with music and song.
How does that grab you?
Finally, you are reading things into the New Testament verses which they simply do not say. In other words, nowhere do they actually forbid musical accompaniment with singing.
This ends our latest reality check.