**Suppose you are a mechanic, and I come to you and ask you to change the oil in my car.**
Using your logic:
So later you come back to get your car, and find out that the oil has not been changed. You enquire why.
The mechanic says, "You never told me to use my tools. I can't do the oil change without tools."
You see, the Word is clear about what is done away with. It does not clearly say that musical instruments are done away with. Yet there are trumpets in heaven.
I will say that when the instruments drown out the voices, then they need to tone it down.
enquire=inquire :/
Mechanical instruments of music are not expedient in order to fulfill the command to sing. They are not a medium through which the command is fulfilled. They are an addition.