An excellent article about selling records, file sharing and trying to flog MP3s via Word Magazine:

web technology lets us see exactly how many people are listening to our music. We can see the MySpace hit counters spin round, with the total number of listeners for each track. Our stats pages on our blogs show us how people arrived at our page, which country they’re from, even which web browser they’re using. We’ve got information about the reach of our music that we couldn’t have dreamed of 10 years ago, and it tells us that thousands upon thousands of people have their ears open, and they’re listening. But, by and large, and with a few exceptions, we can’t fucking sell music to them.