1 Corinthians 15:36 Thou fool, that which thou sowest is not quickened, except it die: 37 And that which thou sowest, thou sowest not that body that shall be, but bare grain, it may chance of wheat, or of some other grain: 38 But God giveth it a body as it hath pleased him, and to every seed his own body.
Divine revelation teaches that God gives to every seed its own body as it has pleased Him. He has made every seed that we sow in the ground exactly in the way that pleases Him.
Because He has made the bodies of even seeds to be pleasing to Him, we know that those seeds are not "neutral" seeds that neither please Him nor displease Him. He made them with bodies as it pleased Him, and even such things that are not used in worship please God because He made them exactly the way that pleased Him.
The belief that "No instrumental music pleases God. It's all neutral--it neither pleases Him nor displeases Him" is a faulty belief that the NT shows to be false. Any instrumental music that God Himself makes or has made is music that itself--regardless of context, setting, use, etc--pleases Him. It is not neutral in the sense that it neither pleases Him nor displeases Him.
Furthermore, the instrumental music itself that God has made pleases Him because He made it!