| http://www.w3.org/ns/prov#value | - After his debuts at age 17 with both the New York Philharmonic and the Philadelphia Orchestra made him an American star, he performed frequently with Pablo Casals in the Prades festivals in France and Puerto Rico and went on to make more than 4,000 concert appearances, collaborating with such conductors as Bruno Walter, George Szell, Leopold Stokowski, Eugene Ormandy, Georg Solti and Leonard Berns
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