This link is to an html file:
".mp3.html"
which is NOT an mp3 file... and it will not work.
If you are storing your mp3s on a sever... then that is NOT the address. It may be a Web page that contains the .mp3, but that is not the absolute address to the actual mp3 on the server.
You really need the actual location on the server of the .mp3 file.
How are you uploading the mp3 files to that server? Are you using FTP software?
VM