Born in Philadelphia, Pennsylvania, Sung began studying the piano with his mother at the age of three. At the age of eight, he began private studies with Eleanor Sokoloff. Sung made his debut with the Philadelphia Orchestra three years later, performing the Mozart Piano Concerto in B-flat major, K. 456 with his own cadenza. In 1982, at the age of thirteen, Sung was admitted to the Curtis Institute of Music, where he continued his musical studies with Eleanor Sokoloff, Jorge Bolet and Seymour Lipkin.

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