What happens when Joshua Bell, one of the world's finest musicians goes incognito in a busy subway in Washington's business district? What happens when a musician who can command $1,000 per minute, takes his priceless Stradivari, dons a baseball cap, occupies a corner in a busy Washington subway, and puts on a virtuoso performance for people who would normally think nothing of paying $150 a ticket to see him perform in a tuxedo.