To make that claim, we'd have to have one or more humans who sat down with David Cope and tried to make the music that he wanted, and failed. I don't think David Cope himself counts, because he has written music "by hand" also, and I don't think he regards it as a failure.

Re EMI/Emmy, it's clearer: the pieces it produced in the style of (say) Beethoven are not better than would be written by a typical human composer attempting the same task.

Now would be a good time for me to acknowledge/recall that my disagreement on this doesn't take away from the original point -- computers are better than humans on many narrow domains.