It will also be interesting to see if Mr Obama will be stern rather than laying on the love with a trowel as he did in Jerusalem when he met Israeli Prime Minister Benjamin Netanyahu.
It occupies a place of honor in the 1, 200-square-foot Rose Museum on the hall's second floor, not far from Fitzgerald's spectacles, the trowel used to lay Carnegie's cornerstone and most precious a ticket from the opening-night concert, May 5, 1891.