AI can be just a tool. You use it the same way you use a keyboard, a computer, a pencil, etc. I'm pretty sure you can build art with it, much like using any tool. People are making art with ascii. You can do art with anything.
But AI can also be much more than a tool, and why can't it have a soul? What's a soul anyway, except something that humans are making up to convince themselves that they are more than flesh and bones? Mythos will not do the same "art" as Fable or Astra would do. AI in 20 years will very likely produce art indistinguishable and as profound as human art. Obviously, humans at that time will always invent new criteria to say why this "art" is not good enough.