"Hirsh, did you ever play the scales?" – Hirshhorn was once asked by a fellow student who noticed that at home he never worked at tone.  "I played them before entering the fifth grade," - was the answer.            

At age fifteen, according to reminiscences, he recorded in a Riga studio the Ballad Sonata of Ysaye . This means that by this time the young violinist could play practically everything.
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