If you're going for legally I would recommend either iTunes or Amazon.com, where you can now
purchase mp3's from albums. Each would cost about a dollar and requires a credit card. I'm hoping
you mean legally, if not then Limewire you could use but I don't

bearshare
Ares
www.mp3000.com
www.artistdirect.com
www.mp3rocket.com
http://filemp3tune.com
http://beat-stop.com
http://www.mp3raid.com
http://www.artistdirect.com
http://www.mp3rocket.com
http://www.filemp3tune.com
http://www.raphsody.com/
http://www.limewire.com
http://www.purevolume.com
http://mp3bag.org
http://www.frostwire.com
http://www.mp3000.net
bittorrent