Books: The Musical Mystique: “Last January, Gene Weingarten, a Washington Post columnist, persuaded the violinist Joshua Bell to join him in an experiment. Bell was to dress in jeans, a T-shirt, and a baseball cap, position himself at the head of the escalator in the L’Enfant Plaza subway station at the height of the morning rush hour, open his violin case, take out his $3.5 million Stradivarius, launch into Bach’s D-minor Chaconne for solo violin, and see what happened.” (The New Republic)