Um...word of advice. Don't have background music start when someone goes to your web site. I know it sounds like a good idea (you are, after all, a pianist...) but most of us find music we cannot control ourselves really, really annoying, no matter how beautiful it is. I generally leave sites that force me to listen to music. I sometimes have my own music playing on iTunes - sites that play music make a real cacophony on top of that! Much better to have files available that visitors can play IF they want to.
Background music often appears on lists of web design "don'ts" BTW - this isn't just my pet peeve.

So, leave it as an MP3 and provide a link to download and play it, would be my advice.