Support ogg not MP3

"The use of MP3 is restricted by patents, while Ogg Vorbis is not. Unlike MP3, there are never any licensing costs for using Ogg Vorbis, and you do not have to worry about anyone suing you for using it without a license. You might have heard about Microsoft's recent loss in a $1.5 billion suit over their use of MP3. These patent lawsuits might never affect you directly, but they create a culture where creative and skilled individuals cannot develop multimedia software without fear of being legally attacked. Using Ogg is one way to support them in their efforts and to encourage a better culture."
FSF - Getting started with Ogg and installing Ogg plugins: