I finally found out how to get the full english theme song. You need an internet history folder with a search feature. (I have Internet Explorer, and don't know how any other web browsers work.) You also need a program that will open mp3 files and save them via the file menu. (I used Windows Media Player.)
1. Go to http://media.putfile.com/Code-Lyoko---W ... show-theme
2. Open up your History folder in Internet Explorer and search for putfile.
3. Click on the result with the strange title. For me it was B4,34215120597.
4. It will open with your music player. Click File, then Save as. Save it, and you're done!