Because, this is what your new Elvis looks like, gang. And, eventually somebody will figure out (and publicly admit) that Kutiman, and any number of his peers on the “To-Sue” list, should be passed from Legal down to A&R.
Can we figure out a way for musicians to be paid that allows this kind of creation to be legal WITHOUT jumping through a myriad of legal hoops? Why can't the whole web be a playground for remixing? If everything is meta-tagged, our tools just need to hold on to the metadata throughout the remixing/revisioning process. Then when we stick it back on youtube, all the original artists get a few more pennies of the general copyright fund™ each time it's played. Why aren't we ALREADY doing this?