s k y f a l l - P M V - YouTube
This is awesome, especially the audio change. The song's a masterpiece anyway, and this remix makes it fit perfectly while not, IMO, losing any of the awesome.
Technically speaking, It's not actually good :/
I know I'm usually a bit harsh when judging AMV/PMV but in all honesty, this one is far from being good.
As for the pitch change, I think it's kinda annoying but that's personal taste I guess.
I'm not an expert, but I think it's the wrong octave change (usually you go for a +115% change in pitch to get the the higher pitch and it seems like this one is not going to +115%).