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Johann Ernst Perabo (November 14, 1845 – October 29, 1920) was a German-born American composer and pianist.
Perabo began his musical training at the Leipzig Conservatory with Carl Reinecke, Ignaz Moscheles, and Ernst Richter. In 1852, he immigrated with his family to New York City. From 1885 onwards, Perabo lived in Boston, where he led a career as a pianist, composer, and music teacher. His most famous pupil was the pianist and composer Amy Beach.
Besides original compositions for the piano (including one Scherzo; three Studies; Pensées; and Prelude, Romance und Toccatina), he wrote numerous transcriptions of and fantasies on operas and orchestral works.