Okay, downloaders, what if you got an e-mail from artist asking you to knock it off?
That's what composer Jason Brown tried.
I signed on to the website that is most offensive to me, got an account, and typed my name into the Search box. I got 4,000 hits. Four thousand copies of my music were being offered for "trade." (I put "trade" in quotes because of course it's not really a trade, since nobody's giving anything up in exchange for what they get. It's just making illegal unauthorized copies, and calling it "trade" legitimizes it in an utterly fraudulent way.) I clicked on the most recent addition, and I sent the user who was offering that music an email. This is what I wrote:
Hey there! Can I get you to stop trading my stuff? It's totally not cool with me. Write me if you have any questions, I'm happy to talk to you about this. [email]firstname.lastname@example.org[/email]
There follows a long & interesting e-mail exchange between Mr Roberts and a young lady who suspects he's a "creeper" but, even accepting he really is the composer, like, totally doesn't get what his problem is.
Also see NY Times Pogue's Posts on the same topic.