How do these not get taken down for copyright??

Go on YouTube type in,

"Hip Hop Urban RnB Club Music MegaMix 2015 - Club Music."

All this guy does is take a bunch of popular songs and combine them in to a singular song with something like FL Studio. I know the copyright system for YouTube can search for songs sent in by the record companies detecting its general settings. A reason why adjusting the pitch can be a BlackHat method in keeping up a popular song..

Anyone?

I thought it was because of the bulk licensing deal that google did with a ton of record companies years ago.

trust me i'm going to get crazy about this subject , not only popular music but a lot of popular things , the problem is they don't change anything in there videos/audioos

Floof said:

Eventually theyll get slammed down. You can't do this for too long before youtube gets caught on, esp if the copywriter gets mad.

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In the meantime, I'd be really happy if I was that guy .

They add a good number of songs which are already remixed, so the owners can be copyrighted as well
The same apply for nightcore songs.