sampling machines don't give you a free pass to sample music all willy nilly, if you're going to publish the result for commercial gain you have to clear the sample, the original artist is getting royalties from it. This is something that was fought for and won by musicians: https://en.wikipedia.org/wiki/Grand_Upright_Music,_Ltd._v._W....

(Not that you implied otherwise, I just want to point that out)