"Songwriters can sort of get away with murder. You can throw out crazy theories and not have to back it up with data or graphs or research."

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And there is a lot of idiosyncrasy. But there are also regularities and phenomena. And what the data is going to be able to do - if there's enough of it - is uncover, in the mess and the noise of the world, some lines of music that actually have harmony. It's there, somewhere.

— Esther Duflo