Since a piano or an organ is usually used as an "aid" to keep everyone in key and in tempo, then that I suppose would be kosher? And since a drum set is usually used for the purpose of keeping everyone on beat and up to speed, then I suppose that would be an "aid" and kosher too?
So if I can't make any vocal sounds because I am a mute, are you going to prohibit me from making melody in my heart by playing a lute or other stringed instrument? Would your "one true" church be engaged in false doctrine if it accomodated the worship needs of mutes?
"So if I can't make any vocal sounds because I am a mute, are you going to prohibit me from making melody in my heart by playing a lute or other stringed instrument?"
Playing any type of instrument is not making melody in the heart.