Interesting article by Dr. Marty Klein (licensed marriage & family therapist and certified sex therapist for over thirty years) who adresses this topic rather well... http://www.skeptic.com/eskepti... ....and yes, there are problems, but no, they are not critical.

To be precise - they do borrow heavily. That does in no way make them necessarily only nearly as rich. Only by looking at a Van Gogh painting, recognizing a tree and then painting a similarily looking tree in my painting doesn't make my painting comparable to a Van Gogh. What they of course do is copy the power of an orchestra and the multitude of simultaneous sounds - but that's just overpowering our brain, not richness and depth.