I've been there before, and they aren't exactly legal. They say "We think giving away the music for free actually promotes video games, so it should be ok" like they aren't actually sure if what they're doing is lawful.
Because I don't want to get banned for posting "illegal" things
Even though it's "illegal" I don't think you can get banned for simply posting links to a website that host's free music... It's not like posting links to warez or something.
Limewire would be best...
Limewire itself is not legal, when you upgrade to LimewirePRO, it costs money, and is completely legal.