Sounds interesting.
But if someone does make this then please make it WMP compatible cause otherwise 50% of people wont be able to use it, including me.
I don't know if this helps
but if you right click on a song in WMP and click properties it shows you the file location. Also, in Winamp if you look at the ID3 tag doesnt it show the location at the top? (I'm not at home so I can't check here.) This probably isn't much help, but meh, bite me.