Rafal Blechacz plays Chopin’s Barcarolle in F Sharp Major at Chopinowski International Competition

A barcarolle (from French; also Italian barcarola, barcarole) is a folk song sung by Venetian gondoliers, or a piece of music composed in that style.
A barcarolle is characterized by a rhythm reminiscent of the gondolier’s stroke, almost invariably a moderate tempo 6/8 meter. (wikipedia)