"The challenge in any musical is unifying all the moving parts of it, in particular a movie musical because now you're adding the camera and you're adding the idea of adaptation. So the challenge is to stay as true as you can to the material that you love and yet not be afraid to step outside of it and introduce elements into it that make it exist in a satisfying, exciting way cinematically."

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Our world is not an optimal place, fine tuned by omnipotent forces of selection. It is a quirky mass of imperfections, working well enough (often admirably); a jury-rigged set of adaptations built of curious parts made available by past histories in different contexts. A world optimally adapted to current environments is a world without history, and a world without history might have been created as we find it. History matters; it confounds perfection and proves that current life transformed its own past.

— Stephen Jay Gould