That famous photo of her on Truman's piano was not her idea.
Bacall, reluctantly, posed on the piano at the request of her press agent Charlie Enfield, who was also publicity chief for Warner Brothers. Bacall later recalled that Truman was a bad piano player. Bess Truman, Harry’s wife, was quite irked according to her daughter Margaret Truman, and ordered Truman not to play the piano in public again.