Saw this graph of the music sales over various mediums over the last few decades. Looking at the graph its easy to see why the music industry are so pissed off with the radical changes. They have been so comfortable with seeing massive profits off the back of CDs sales that their expecting even bigger profits from the next format. However thats not going to happen. The article on evolver magazine goes into much more detail, although you can imagine what it says without reading it.