Dear 100 Hour Board,
I know you can't give legal advice, but you can answer questions about what the laws are, right? I'm wondering if it's illegal to download covers, mash-ups, etc. that aren't available for sale anywhere.
You're right. We can't give legal advice. So I'll let this website tell you:
"Just because there may not be a legal way to get a copy of something does not magically remove copyright or copyright restrictions. In other words, copying copyrighted material without permission is illegal, whether it’s otherwise available or not.
If there’s no legal way to get a copy, then you can’t get or make a copy without breaking the law. Period."
-guppy of doom