Theft of intellectual property has gotten completely out of control in the music business. This story
in the WSJ has an amazing chart showing that album sales have gone down from around 800 million in 2000 to somewhat over 400 million in 2008. I don't know whether there is some bias here breaking these down in terms of albums and not individual songs. The drop since 2000 has been almost continuous. It is hard to believe that illegal downloading isn't responsible for at least a good share of this drop.