From the "user agreement" of the ONLY .mp3 server that I use...
"Audiogalaxy's Copyright and Intellectual Property Agent for Notice Audiogalaxy respects the intellectual property of others, and we ask our users to do the same. Audiogalaxy may, at its own discretion, disable the accounts of users who may be infringing the intellectual property rights of others. If you believe that your copyrighted work has been copied and is accessible on this site in a way that constitutes copyright infringement, you may notify Audiogalaxy's copyright agent."
Napster is a thing of the past...and for those of you bitching and whining about .mp3 services taking money out of your pocket, why don't you get off of your dead ass and put your music on a server that also hosts artists? A good (read: legit) .mp3 server often has many services for artists, including some no-fee stuff.