It's about using the sample in a way that it doesn't directly rip off the sound of the original (c) Darren Feltmann

The pic below is a tree of a only a few of the songs that have used a MJ sample....
Sampling is intense... and I have so much fun guessing the sample's used in current songs... For those that aren't as well versed... there's a website for you... Check out WhoSampled.com it's a crazy database of cover music and sampled songs... it's pretty much SPLENDID.