Numbers 10:1-10 reveals that God directed His people to make two silver trumpets and then assigned specific meanings to various uses of those musical instruments. For example, blowing the trumpets signaled that the entire assembly gather at the door of the tabernacle (Num. 10:3) whereas blowing only one trumpet signaled to the princes to gather to Moses (Num. 10:4).
This passage shows that certain humans have been supernaturally directed concerning assigned musical meanings communicated by specific uses of certain musical instruments. Paul’s instruction to the Corinthians concerning an apparently well-understood response to a trumpet being used in a specific way (1 Cor. 14:7-8) may attest to something similar or may in fact refer back ultimately to God’s revelation to Moses that Numbers 10 records.
Scripture also reveals that demonic spirits have influenced human beings to do many things without those human beings having any knowledge about such influence directing them to do so (1 Chron. 21:1; 2 Chron. 18:21; Acts 5:3).
Just as God directed His people to do specific things with musical instruments that would convey specific assigned meanings, it is entirely possible that demonic spirits have influenced human beings to do things with musical instruments that communicate specific assigned meanings in the heavenly realm, meanings which are entirely unknown by humans and unknowable by them apart from supernatural revelation (either divine or demonic) about those meanings.
To hold that demonically assigned musical meanings to human use of musical instruments in specific ways is impossible has no biblical basis and goes against specific divine revelation about supernatural influences on humans that have directed them to do things that the humans had no knowledge were their actually doing what the supernatural beings wanted the humans to do. We must consider also that various rock musicians have testified of demonic influence upon them in their producing and playing their music.
Aside from the corrupting influences of rock music on its human hearers, we must consider the possibility that rock music has a demonically assigned meaning to it such that anyone who plays music in that style communicates anti-God sentiments to supernatural beings, sentiments which are humanly unknowable. Such a possibility provides one more valid reason for Christians not to listen to, play, or use rock music in any other way.