If you're looking for a p2p network to share and find music, SoulSeek is the best option in my opinion. You can find it at http://www.slsknet.org/ .
What's good about it?
- you can find virtuamy any artist you're looking for.
- a great community (integrated chatrooms).
- What's not so good about it?
-you can only download from one source per file/folder you're downloading.
But since almost everyone has cable nowadays, slow speeds aren't really a problem anymore.