(!BAD ID3v2)

ITunes does not recognize the tag.

I do not want to convert to mp3 files again.

What is the solution?

The example downloading the file link: http://www.mediafire.com/download/f3qz8nzs...s+de+guerra.mp3

Mp3val-frontend not work.

If you have a bad ID3 then cut it completely from the file.
Try it with MP3tag and/or Foobar and/or Mp3diags.

^ +1

Just select, File - Remove Tag and enter the Info again and select File - Save Tag.