The first american-born piano virtuoso to achieve international fame was

Louis Moreau Gottschalk was an american born piano player. He was born in New Orleans, in May 8 1829, and died in December 18, 1869 in Rio de Janeiro, Brazil.
He was widely known as a virtuoso player for his talent with the romantic piano. He spent most of his professional time outside the US.

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Hey user  he  bachs contributions to the baroque period were bassed of keyed instruments