On this edition of The Arts Section, host Gary Zidek previews the latest installment of a Chicago orchestra’s annual Martin Luther King Jr. tribute concert. Gary also revisits a suburban man who is responsible for some of the most candid photos that exist of the late civil rights leader. Later in the show, Gary catches up with Chicago-based vocalist Paul Marinaro to talk about his new album, MOOD ELLINGTON. And we’ll hear what the Dueling Critics have to say about a new play titled THE UNKNOWN VARIABLE.