XMMS-Musepack is an audio output plugin for the well known xmms on Linux. Andree Buschmann's en-/decoder is a great improvement of lossy audio compression compared to MPEG-III. Give it a try!
Frank Klemm has added many speed optimizations and continous
XMMS for embedded / pocket devices, like sharp zaurus and compaq ipaq
with QT/Embedded gui plugin, instead of the original gtk one (which is
not available on the sharp zaurus out of the box)