It appears that, early in his naval and musical career, Russian composer and orchestrator Nikolai Rimsky-Korsakov visited the US along with the Russian Atlantic Fleet in 1863. He was a midshipman on the Imperial Russian clipper Almaz, and even found time to visit Niagara Falls.
http://feefhs.org/members/blitz/1863-1864.html
http://feefhs.org/members/blitz/1863-1864.html
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