Music that has been registered with the Copyright Office. Under present law, copyright exists upon creation of a work; the registration process creates a legal record of the work's existence, and its approximate date of creation. Copyright notices are recommended for any works that go outside the creator's control, whether the works are formally registered or not.

Uncopyrighted Music is music that hasn't been signed by a Record company. Uncopyrighted music is free for you to use on your channel without having to worry about getting a strike.

You usually can tell when you click on a song if it is copyrighted by if it has a icon in the bottom corner telling you to buy this song now. That is a easy way to tell if a song is copyrighted.

Here is what it looks like

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If music is Uncopyrighted, It will not have that buy it now icon in the bottom right corner of the video, next to the description.

There are many channels on YouTube dedicated to helping you find music that is Uncopyrighted. I will link you some channels where I like to get my music.

One major reason is that If you have Copyrighted content you won't be able to apply for a YouTube partnership. You may get Copyright claims which may result in your YouTube channel being terminated.