Original version that comes with this melody
 

There's an electronic music song with a very nice melody, but I'm seriously skeptical about its originality since I'm almost sure it must be a remix of a previous -and probably classical- song.

This is the hypothetical remix I was referring to:



In my opinion, such brilliant melody hidden in a contundent electronic style like this one may not be original, and in case I'm right I would appreciate a lot the knowledge of the original version's author and title.

Thanks in advance.

Sounds like it could be original to me.

Well, some people claim that it has been listened as a symphonic music version with those same chords/melody in a documentary, that's why I asked, but thanks anyway for your answer.

"contundente" means "blunt" in English.