From Aerodrome Software:
AeroPlayer turns your Palm handheld into a portable music player by playing digital audio files stored on an expansion card. Just plug in your headphones and listen to your music anywhere you go. Features include CD-quality stereo sound playback; support for 16-bit color skins; background playback, so you can run other programs while playing music; playlist support; AeroPod control panel to let you control the music from any other program; AeroPod integration with QLaunch; and built-in support for Ogg/Vorbis audio files. Version 2.11.1 adds Polish language support, minor bug fixes.