...you'll (have) notice(d) it everywhere:
This one single 6-second sample has been used mind-bogglingly widely. Copyright law seeks to prevent this form of creativity, even though the actual creators of the Amen Break did not pursue people for using it.
The video finishes with this great quote:
Overprotecting intellectual property is as harmful as underprotecting it. Culture is impossible without a rich public domain. Nothing today, likely nothing since we tamed fire, is genuinely new: Culture, like science and technology, grows by accretion, each new creator building on the works of those who came before. Overprotection stifles the very creative forces it’s supposed to nurture.Judge Alex Kozinski, Dissent re: White v. Samsung Electronics America, Inc.
It's a long video by YouTube standards, but stick it out - it's a good one.