I believe this is an extraordinary achievement. Music as it was before has already been decoded. But, me being a musician, music is for me a wordless form of expression. I personally have heard some of this creations and to put it in a simple way i would use this example:

Imagine that a Beethoven symphony is this phrase:

"Music is the most amazing thing that could ever happen to human kind"

David Cope's programs creations would be something like:

"Music most thing human amazing is the happen could never kindly".

I mean this with no disrespect to the huge work of programmers and all the analysis that had to be done to achieve this. But geniuses like Bach, Beethoven or so, did their music with INTENTION, and music without intention is just a mere collection of sounds following the "rules" dictated by the different composing styles.