On the evening of July 14, 1935, just behind the Lincoln Memorial, on the steps of the Watergate Amphitheatre, 10,000 Washingtonians, dressed in flannel and gingham, sat on blankets and newspapers. Out on the water, hundreds of others dressed in bathing suits floated in canoes, eager to experience Washington’s newest summertime tradition: floating concerts by the National Symphony Orchestra. The NSO was taking to the water, inaugurating a new “Sunset Symphony” series, wherein the orchestra would offer summertime performances on a 75 foot concert barge bobbing in the Potomac River.