Can computers be "creative"?

It is a well known fact that some of the most original moments in Beethoven's Ninth Symphony have been the result of printers' error. Also the Finnish composer Einojuhani Rautavaara has reported that he has got some of his ideas when hitting a wrong piano key during composing. So it seems that live composers may use randomness or serendipity as a creativity tool. It is a kind of a paradox that computer music based on randomness has not been so successful. The Synestesia Software does not use randomness at all, all pieces are deterministic. LAURI GRÖHN