Perhaps the debate is, to some degree, semantical. I think most everyone would agree that vehicles of communication deliver messages, and those messages are certainly not limited to the words. Messages may be communicated in images, as well. I'm not sure it can be proven that any image certainly communicates a moral act. Some certainly may communicate morality or immorality, depending on the context. I'm convinced it's true that some images certainly depict immorality.
In other words, human hearts are the center of morality, not the things that human hearts produce. Powers puts it this way: "You cannot attach a label of 'moral' or 'immoral' to anything other than the heart of a man or woman."
That doesn't mean anything goes in our choices, even our musical choices. It does mean that the object that deserves the real scrutiny is the human heart and its lusts, motivations, and deceitfulness. As Powers says, music is a tool, and . . .
Tools are created by mankind as an expression of either the righteous or evil intentions in his heart. The tools are used by the individual for carrying out the designs of the heart. The man will be judged by God not the tool.