Mr Obvious23
That would turn out as bad as changing the mario bros. theme would.
Also it reminds me of a battery advert for some reason.
Well, incase you missed it, they did change the Mario brothers themes from game to game. Each new game had a new theme and different music to it. But the fact was that the music fit great. So it worked out.
As for the theme, I would actually like to see the Black Mage version of the boss battle theme used. It has the same classic theme, but with a badass kick to it.