“Peer-to-peer file sharing has far outstripped legitimate sales; 50 billion files are shared annually in America. That’s a robust business, a sign that music has never been more popular. But it’s a business that has essentially turned recorded music into a marketing tool for an artist, rather than a revenue stream. With that shift, a whole bunch of 20th Century business constructs — the record label, the record store, publishing companies — are in serious jeopardy.”