
The theme they composed for Magneto is surprisingly intimidating and powerful. You can feel the anger he displays when he's killing Nazis in Argentina and when he's going after Shaw on his private yacht.
Then they have a powerful one for when his channeling his inner peace to move heavier metal objects that feels like they used the same motif or beats as the one when he's angry. It shows that he is the sane character, yes, but he has grown substantially.