David Cope is Professor Emeritus at the University of California at Santa Cruz, and in 1981, he designed a computer program that deconstructed music, analysed it and then put it back together in different forms and structures it had identified.
The results are essentially new recordings from Bach, Beethoven and Chopin as well as a host of others. This isn't an interpretation on existing music, this is actually new music.
EMI's version of Bach
EMI's version of Beethoven
EMI's version of Chopin
And you can check out all the others at his webpage here.
And it's not just music. Ray Kurzweil and Harold Cohen have spent the past thirty years inventing software that can create art. It's called Aaron and like EMI is has deconstructed art, analysed it and can now create new pieces in seconds.
You can read about Aaron at Harold's webpage here. You can also download a screensaver that uses Aaron Software to create an infinite number of original artwoarks created by Aaron on your computer. Every new picture is different.
Watch a real audio video clip here
For the wordophiles out there, here's a collection of essays written by Ray Kurzweil on Machine Intelligence and Creativity, here.