Audio MP3
You have found the way to MP3 on Audio:
AMPlayer - Module for playing Audio MPEG files (MP3). An example WIMP front-end is included, but you can easily make your own.
Audiogalaxy Satellite - Share music over the internet.
MP3 Utilities - Including CSV catalogue, error tester, and WAV converter.
Shine - Port of an MP3 encoder, optimised for speed on both ARM and StrongARM processors. Help build the largest human-edited directory on the web.