A 19-Year-Old Pianist Electrifies Audiences. But He’s Unimpressed.

After six hours of sleep and a breakfast of milk and curry rice, Yunchan Lim, the South Korean pianist, was in a rehearsal studio at Lincoln Center on Tuesday morning working through a treacherous passage of Rachmaninoff.

“A little bit faster,” Lim, in a black sweatshirt and sneakers, said casually to the conductor, James Gaffigan, as they prepared for Lim’s New York Philharmonic debut this week. Gaffigan laughed.

“Usually pianists want the opposite!” the conductor said.

Lim — shy, soft-spoken and bookish — stunned the music world last year when, at 18, he became the youngest winner in the history of the prestigious Van Cliburn International Piano Competition in Texas. His victory made him an immediate sensation; a video of his performance of Rachmaninoff’s Piano Concerto No. 3 in the finals has been viewed more than 11 million times on YouTube. (He will play that piece with the Philharmonic this week, under Gaffigan’s baton.)