By Arion McNicoll and Stefanie Blendis -
Hans Zimmer, the creative force behind some of Hollywood's best loved film music, including the Oscar-winning Lion King score, adjusts his chair in front of a sleek black instrument that looks something like the control panel of a stealth bomber.
He raises his hands to the monochrome keyboard and presses gently. A familiar strain emerges from it: the opening lines of the Dark Knight theme, but today it sounds unlike it has ever sounded before.
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