In his influential 1936 essay, “The Work of Art in the Age of Mechanical Reproduction,” critic Walter Benjamin used the word “aura” to describe an artwork’s “presence in time and space” — an explanation of the thrill, or chill, we get from standing before a Jackson Pollock, say, or a Michelangelo, rather than a photograph of the same. Writing in the age of radio, photography, and newspapers, Benjamin believed that aura could not be transmitted or copied: “Even the most perfect reproduction of a work of art is lacking in one element” — that rare thing that makes art worth preserving and reproducing in the first place. Let’s grant, for the sake of argument, that musical instruments have aura — that the very sounds they make are its manifestation, and that, no matter how sophisticated our technology, we may never reproduce those sounds perfectly. As Hank Green explains in the SciShow video above: “For centuries, musicians, instrument makers, engineers, and scientists have been trying...