Samuel Charters helped ignite the blues revival of the '50s and '60s. He made field recordings of forgotten and previously undiscovered performers. He also wrote two books. He died Wednesday; he was 85. Phil Klay served in Iraq from January 2007 to February 2008. He recently won a National Book Critics Circle award for his collection of short stories, 'Redeployment.' John Powers reviews 'Seymour: An Introduction,' an inspiring new documentary by the actor Ethan Hawke.