Gmu is an open source music player. Gmu supports Ogg Vorbis, MP3, Musepack, FLAC and various module formats (such as s3m, stm, it, etc.). It also includes a playlist and a file browser. radon86 compiled it for the GCW Zero.

http://boards.dingoonity.org/gcw-releases/gmu-music-player-for-gcw-zero/