MUSIC AT THE WHITE HOUSE: A HISTORY OF THE AMERICAN SPIRIT, by Elise K. Kirk states in part, "John Jacob Niles also played the dulcimer. “It can be played at the supper table if you like,” he wrote to Mrs. Roosevelt, who invited him for dinner at the White House on April 15, 1934.”
In the notes for that chapter it states, “A dulcimer, a gift from Niles to FDR, is at the Museum at Hyde Park.”