Don't you think music can sound like made by humans? What about this article written 6 years ago? https://www.bbc.com/future/article/20140808-music-like-never-heard-before We humans tend to believe we humans are required at any time for specific tasks, like creating something with our creative minds. But I think this is what we want to believe as humans. AI will develop such that we humans will not be able to distinct even a robot from a real human. That doesn't mean the robot is human in the sense it has a conscious, but it acts 100% like a human at all times. When that is - to me - a certainty, such AI can (and will) also create art that is nothing different to what we humans can create. How long this will take before we are there, that is the question, but I predict this to be more sooner than later. Give it a few decades, maybe a few more decades and then we are there, whether we like it, or not :)