Original: In a curious experiment initiated by Washington Post columnist Gene Weingarten, Bell donned a baseball cap and played as an incognito street busker at the Metro subway station L'Enfant Plaza in Washington, D.C. on January 12, 2007.
Simplified: In an unusual experiment the Washington Post asked Bell to stand in the street and busk (play his violin) by the entrance to a Washington Metro station one cold morning in January 2007.