Using the on board speaker you can play MP3’s via the bug_audio module. You won’t be DJ’ing parties with it but it’s still fun to see.
I built mpg123 and included a sample mp3 in the binary package. Download the package from http://bug.cmw.me/mpg-bugr14.tar.bz2 and transfer it to the Bug Base. Then just extract the files into / and modprobe bug_audio.
To play the example type mpg123 -a /dev/audio /home/root/Jingle_Bells.mp3