Wow... I mean... I guess technically you could call being really good at choosing which samples you use a sort of "art?" Even if I grant that, though, do you really think your point here is in line with William's original definition? Again, I'd be much more inclined to place electronic music realization in its own art form category when it's comprised of things that are unique to the medium - impossible tunings/ranges, processing, or combined sounds not possible in reality. That sounds new, to me.
The title of the thread is Composers Who Use Samples for Art. I won't argue that a symphony written with the help of samples is every bit the art writing it by hand would be - of course it is, it's just a different tool being used to realize it. I argued from the beginning that using such samples just wasn't an entirely "new form of art," rather a different way of getting to the same place. While I can see semantical points like, "choosing good samples is an art form unto itself," I still further feel that if you want to place something in the category of new, it has to be precisely something not possible before. Realizing orchestral music was possible before samples. Difficult for a lot of people for logistical reasons, but that doesn't mean they've created an entirely new art form by buying a Gigastudio. Now if they take those samples and create sounds and music which are not possible to replicate traditionally, NOW you're talking about a new art form. That's my take, anyway.
_Mike