I live in the us and want to know the best software for getting music, movies, games, etc.

As far as I know there isn't a peer to peer software that is 100 % legal, I could be wrong it wouldn't be the first time.

The P2P software itself is not illegal. Its using it that could result in your downloading something that you do not have the license to do so that causes the breach in law. For example, I use the BitTorrent protocol via a client called Azureus. Most of my downloads I get linkts to from suprnova. Now while there are many illeagal downloads on there there are also hundreds of open source torrent files. When the latest Linux distro is released the download servers get maxed out and P2P provides a way for the community to ease the load.

So in short, use any P2P you want, just be sure to not share or download material that you are not supposed to.

And make sure it is Spyware Free! See this Article: http://www.spywareinfo.com/articles/p2p/