I found a domain with a music artist in it, I posted this thread in domain section and didnt get any advice (not many viewing) I am just wanting to know if I should go after it.. Example : johnnycashdownloads. com ofcourse its a more popular artist right now, 8100 global and 6100 local [exact]
Will I get into trouble with an artist's name in the domain?

looking for similar advice ...

You could. It's no different than using companies or trademarks. Can't really say yes or no.
I have have about 130 trademarked and company EMDs. One company sent C&D for three of their products, rest don't care. Just had a law firm email me today because I registered a company's expired domain as they switched to a new domain.

However the product ones I have are promoting their product, so they really shouldn't care too much. But in your case you're trying to make money off their name, so they may take offense to it. Mind you, if it's a legit service, I guess the money would get back to them like it does in my case. But if you're doing illegal stuff, then I'd probably just avoid it all together.

would you think Id have issues with sharing free music (with content locker) on music downloads?

Tough to say man. I don't want to say you'll be fine, and something happens.