There's no shortage of people who put up full music videos, and a lot of this has to do with enforcement of copyright or royalty redirection or fair use.
The first involves music videos that are not part of big publishing houses or recording companies or big labels.
These can be independent music or they can be very popular music from different countries whose licensing agencies aren't really all that active in the United States.
Whatever the case may be, you can put up popular music videos that can pull a lot of traffic, especially from certain countries or certain regions of the world, and not get any copyright or intellectual property flak.
Don't let that inactivity fool you in terms of the law.
I'm talking about global copyright law here that you are infringing.
But just because people aren't aware of it and people haven't bothered to enforce their rights doesn't mean that those rights don't exist.
It's only a matter of time until the hammer comes down.
Usually, the hammer comes down in this form.
Instead of a copyright strike and your channel being wiped out, a lot of the times, YouTube will just redirect whatever royalties and money you could have made from that video to the legitimate rights owner.
But they have to first step up.
And now if you are featuring music that is covered by the key and the most widely recognized music publication and artist rights protection groups in the United States, you're going to run into trouble immediately and royalties will be diverted.
If you're dealing with international music or really niche amateur music from the US, you may be able to make money off that music video because the people who really own that content are none the wiser for it.
But once YouTube finds out that you're passing off somebody else's intellectual property as your own, be ready to pay the price.
The third possibility here is fair use.
Based on how you described the music being uploaded, it seems that there's really no additional original content added to the music video.
Did I get that correct?
If that is the case, then go back to my initial analysis.
On the other hand, if you change the format and add some captions that have opinions on them and the captions change to critique different parts of the video or better yet, you're reacting to the video, reviewing it, or making it part of a larger social or news commentary, then you would be able to get away with it.
It depends on how much of the content is sampled, the purpose of the sampling, and other factors.
This exception is called the fair use exception.
This is widely known, and widely accepted, and YouTube will allow you to get away with it.
It all depends on the factors that I've listed above.
