Here's a short explanation about "What's wrong with MP3?":
"As an artist, the royalties on MP3 mean that we'll have to pay a flat fee on every single track of our own music that's downloaded. It might only be a few cents at the moment, but the people who control the technology will be able to charge us whatever they like in future. And this will mean we won't be able to give away free tracks even if we want to! - So it's about YOUR freedom to be able to listen to music!!"