I've recently built a mythtv box to house my MP3's/pictures/games/yada-yada-yada, infact everything except the PVR bits

I've downloaded all my MP3's from my empeg using emplode, as I couldnt remember how you got jemplode to do it.

So, I've now got 50Gb's of my MP3's in a filename structure that needs resetting to Artist/album/trackname.mp3

Any suggestions on what software I can download to rejig the structure?