The original version isn't on the piano if i'm correct. The original version you can listen to here:
http://www.youtube.com/watch?v=6wpPk8qk3uQ

It's on the CLavesimbel and violin and of course more.

The piano versions can be found here:
http://www.mx-music.com/sheets.php?page=P&sortby=Artist

It says (Original) behind one of the three so that must be it right :P