A onetime child prodigy, at 39 Joshua Bell has arrived as an internationally acclaimed virtuoso. Three days before he appeared at the Metro station, Bell had filled the house at Boston's stately Symphony Hall, where merely pretty good seats went for $100. Two weeks later, at the Music Center at Strathmore, in North Bethesda, he would play to a standing-room-only audience so respectful of his artistry that they stifled their coughs until the silence between movements. But on that Friday in January, Joshua Bell was just another mendicant, competing for the attention of busy people on their way to work.

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Bell decided to begin with "Chaconne" from Johann Sebastian Bach's Partita No. 2 in D Minor. Bell calls it "not just one of the greatest pieces of music ever written, but one of the greatest achievements of any man in history. It's a spiritually powerful piece, emotionally powerful, structurally perfect. Plus, it was written for a solo violin, so I won't be cheating with some half-assed version."