If you're a YouTube sensation-in-waiting, just gagging to unleash your parodies onto the world, what is it that you can and can't do under the new rules? For a start, you can make a pastiche, caricature or parody, and while there's no word on transformative works (i.e. mashups like Buttery Biscuit Base and They're Taking the Hobbits to Isengard) we'd imagine they're pretty safe, too. What you can't do is making something so similar, that people might buy or listen to your work instead of the original, so you probably can't make a Weird Al-style version of a pop song -- so Newport State of Mind would probably still not be covered. You're also not able to contravene the original creator's moral rights, which means you need to give credit where necessary and you can't defame the author by association. That means that you can't compare your least liked recording artists to any European war criminals of the 20th century, no matter how badly their music stinks.