You might have to upgrade the RealAudio codec... I think
. I know I had to last year. you can google bits and parts of hit to get the latest updates of the music codes.
Kate also created the bandster MOD which is like the MusicOnline MOD, but more geard towards unsigned bands or artists online. but... again.. she also abandoned that MOD just recently.
Here is the link to Bandster if anyone is intrested. it is in BETA and not recommended for live sites BUT.. probably because of minor bugs. it works pretty well for a Beta mod if you ask me.