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That's because it's pretty "inspired" by Hans Zimmer. Compare their video here (http://www.youtube.com/watch?v=6qcMK1vPWFM#t=35s) with Hans' Pirates of the Caribbean theme (http://www.youtube.com/watch?v=oVmjAM5o1jg)

Amazing - I thought of Hans as well, but a different movie - Gladiator.

It is definately Hans Zimmer, but with the short part they used in the movie it might as well have been the theme to The Rock.