I achieved something. I changed it to
Actionscript Code:
music.loadSound (musicURL + "music"  +".mp3", true);

And now the output panel says:
Error opening URL 'file:///C|/wwwmysite/eskapate/root/undefinedmusic.mp3'

Omg...just one step to achieve it!!! If we manage to put it like
file:///C|/wwwmysite/eskapate/root/music.mp3' is done!