If a song is pre-remixed, is it royalty-free?

Like if I wanted to add a song to a YouTube Video but the song is copyrighted, I know that it's okay to do that if it's remixed, but what if it's not your own remix? Are you allowed to copyright your own remixes? Are most remixed songs up for grabs (in remix forms only of course)? I know this is more... show more Like if I wanted to add a song to a YouTube Video but the song is copyrighted, I know that it's okay to do that if it's remixed, but what if it's not your own remix? Are you allowed to copyright your own remixes? Are most remixed songs up for grabs (in remix forms only of course)? I know this is more than one question, but I think these are really cool questions to look into and utilize.
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