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The extraordinary dedication of the young Mozart, under the guidance of his father, is perhaps most powerfully articulated by Michael Howe, a psychologist at the University of Exeter, in his book Genius Explained. He estimates that Mozart had clocked up an eye-watering 3,500 hours of practice even before his sixth birthday.
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Matthew Syed (Bounce: Mozart, Federer, Picasso, Beckham, and the Science of Success)