Nikolai Rimsky-Korsakov
He continued to learn the piano while he was at Cadet school. He was never a brilliant pianist, but he enjoyed  playing tunes from operas on the piano. He got to know several young composers who were already becoming famous: Balakirev, Cui and Mussorgsky.  Balakirev gave him advice about his compositions. He started to write a symphony, but then he had to go to sea for two-and-a-half years. He sailed on a clipper called Almaz. The boat went to Gravesend, the Baltic Sea, New York, Rio de Janeiro and the Mediterranean  When he got back, Balakirev made him finish the symphony.