Tom Kotík, artist and musician based in New York, is the great-great-grandson of Czechoslovakia’s first president, Tomáš Garrigue Masaryk. He returned to Prague to witness the unveiling on Friday of a sealed envelope believed to contain Masaryk’s last words. In an interview for Radio Prague International, he reflects on his Czech-American identity, the influence of his family history, and his life in art and music.