Actually, it's only a big deal if you want to use a famous person's rendition of a song. Licensing the performance of a song by, I dunno, the Red Hot Chili Peppers would cost you an arm and a leg. Making your own cover of one of their compositions is, iirc, 11 cents.
Yeah, well said. You're a pretty convincing dude, I'll say. You should try to do that, you know, like for a living somehow.