The Java Media Foundation no longer includes support for decoding mp3 files, so I've been on the prowl for another cross-platform open source decoder. I was excited to find FMod (www.fmod.org) and even more pleased to find that the Java Native Interface to FMod is included in the Light Weight Java Game Library (www.lwjgl.org). Using lwjgl is a bit of overkill but it works great, and that's what matters.