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One of my piano students wants to play the theme from the Pacific Rim movie. Is it just me, or does that first riff sound a little too much like Black Sabbath's "Iron Man"?

Here's the Pacific Rim theme: http://www.youtube.com/watch?v=1DABGdvCOs4

Here's Iron Man: http://www.youtube.com/watch?v=9LjbMVXj0F8

What's even more peculiar, is that he composed for the movie, "Iron Man"

http://en.wikipedia.org/wiki/Ramin_Djawadi

Not very similar to me.

They both contain one short melodic section where the riff slides up a down on a minor 2nd interval. Almost like a mordant or trill.

That's about the only similarity beyond the fact those both are "rock".