Music composed by a computer program (AI)

[Daimonion]

I've just read about computer programs designed to compose music. Do you know any worthwhile composition produced (I am hesitant to write 'composed') in this way?

http://www.youtube.com/v/t6WeiyvAiYQ

I'm interested in the topic in the context of artificial intelligence. Hence, I'd be interested in those pieces, especially, which are similar to (or even indistinguishable from?) human music.