I think algorithms are perfectly capable of generating music we'll consider creative an beautiful - the trick is, you can't tell people it was done by a computer!

Look at the examples you've provided. They gain additional meaning because of the context information you've given. When dealing with art, people like to wonder, what the author thought? How did they feel? People try to connect. With machines, they know there is no human to connect to on the other side, so the work will be considered inferior.