Internet music piracy has no negative effect on legitimate music sales…
“Consumption of music increases dramatically with the introduction of file sharing, but not everybody who likes to listen to music was a music customer before, so it’s very important to separate the two,” said Felix Oberholzer-Gee, an associate professor at Harvard Business School and one of the authors of the study.
http://www.washingtonpost.com/ac2/wp-dyn?pagename=article&contentId=A34300-2004Mar29¬Found=true