Modern classical music is music written in the 20th century and beyond. Although much of it draws heavily on earlier forms, modern composers also experimented with rejection of long-held ideas; notably, Arnold Schoenberg questioned the traditional notions of harmony with his twelve-tone system[?], and John Cage questioned the very definition of music with his use of chance and found sounds.
... (1821-1890), looking for the source of the Nile, discovered Lake Tanganyika
Richard E. Byrd, (1888-1957), explorer
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John Cabot (Giovanni Caboto) - Italian navigator ...