Our musac speakers can't be turned off, so I long ago attacked all the ceiling speakers with wire cutters. Presto- no more annoying music in our department. President of the company happened to walk by why I was on the top of a desk, dealing with one of them, speaker in one hand, wire cutters in the other. He asks what I'm doing. "Turning the speaker down." "Okay", he shrugged, and walked off.