FMP3 is an mp3player that makes it possible to add a music background to one's site (.mp3).
It's very simple to add it to your pages, and it's customizable too.
You may in fact modify some settings as colour, track title and volume.
Here's an example of FMP3 at work:
(click on the play button to start audio)
Instructions on how to insert the FMP3 player in your EditArea site