Popular music is chiefly about disguising theft. Hiding who you stole what from is how an artist can thrive in the music business.
Sampling used to be a big issue in music but it has all but disappeared because artists developed a great deal of sophistication about how to steal something without being caught or held legally accountable. Lawsuits and negative articles and bad reviews used to accompany the sampling artist on the road to infamy. Now they just tweak it a bit and change the tone and get away with it. Perhaps that's why everything sounds horrible all the time.