The music is a 13 second sample from .hack//SIGN original soundtrack 2, from the song In your mind, composed by Yuki Kajiura, who is awesome.|
To view the source code, right click and select the view source option. I'm not sure how well this code is handled in netscape, but it works fine for internet explorer.
If the music doesn't play initially, try reloading.
You might also check out this link for more info.