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When Tchaikovsky finished writing his Violin Concerto in 1878, he asked the famous violinist Leopold Auer to give the premier performance. Auer studied the score and said no—he thought the work was unplayable. Today every young violinist graduating from Juilliard can play it. The music is the same, the violins are the same, and human beings haven’t changed. But people have learned how to perform much, much better.
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Geoff Colvin (Talent is Overrated: What Really Separates World-Class Performers from Everybody Else)